Mental Maths

1.
Find the difference between 6 and 17
Find the difference between 27 and 35
Find the difference between 84 and 78.
Find the difference between 22 and 100
Find the difference between 150 and 1000
Find the difference between 2.5 and 5
Find the difference between 2.5 and 10
etc
2.
Look at the numbers. Put a circle around all of the multiples of 10 (234, 476, 500, 250)
Look at the numbers. Put a circle around all of the multiples of 5
Look at the numbers. Put a circle around all of the multiples of 3
Look at the numbers. Put a circle around all of the multiples of 2.
*
One of these numbers can not be divided exactly by 10. Put a ring around this number.(60, 110, 850,
120, 90, 101)
One of these numbers can not be divided exactly by 5. Put a ring around this number.(60, 110, 850,
120, 90, 101)
One of these numbers can not be divided exactly by 3. Put a ring around this number.( 369, 561, 309, 452)
One of these numbers can not be divided exactly by 2. Put a ring around this number.( 368, 566, 309, 452)
*

Look at the numbers. Put a circle around an odd number which is also a multiple of five. (60,110,85,120,90)
3.
A robot is facing north. It turns 90◦ clockwise. In what direction is the robot now facing?
A robot is facing north. It turns 180◦ clockwise. In what direction is the robot now facing?
A robot is facing north. It turns 270◦ clockwise. In what direction is the robot now facing?
A robot is facing north. It turns 360◦ clockwise. In what direction is the robot now facing?
4.
A TV programme starts at seven. It lasts twenty minutes. At what time does the programme finish?
A TV programme starts at seven. It lasts twenty-five minutes. At what time does the programme finish?
A TV programme starts at quarter to seven. It lasts twenty minutes. At what time does the programme finish?
A TV programme starts at quarter to seven. It lasts twenty-five minutes. At what time does the programme finish?
A TV programme starts at half past seven. It lasts thirty-five minutes. At what time does the programme finish?
etc.
5.
What is the remainder when 27 is divided by 5?
What is the remainder when 56 is divided by 5?
What is the remainder when 27 is divided by 4?
What is the remainder when 27 is divided by 9?
What is the remainder when 64 is divided by 8?
etc
6.
A bus ticket costs 25p. If I buy a ticket, how much change will I get from £1.00
A bus ticket costs 35p. If I buy a ticket, how much change will I get from £1.00
A bus ticket costs 54p. If I buy a ticket, how much change will I get from £1.00
A bus ticket costs £1.50. If I buy a ticket, how much change will I get from £2.00
A bus ticket costs 35p. If I buy a ticket, how much change will I get from £2.00
*
A bus ticket costs 25p. If I buy 2 tickets, how much change will I get from £2.00
A bus ticket costs 25p. If I buy 5 tickets, how much change will I get from £2.00
etc
7.
Write two numbers that have a difference of 3.
Write two numbers that have a difference of 9.
Write two numbers that have a difference of 16.
Write two numbers that have a difference of 26.
Write two numbers that have a difference of 59.
Write two numbers that have a difference of 148
etc
8.
I need 23 buttons. The shop sells buttons in packs of 5. How many packs do I need to buy?
I need 48 buttons. The shop sells buttons in packs of 5. How many packs do I need to buy?
I need 23 buttons. The shop sells buttons in packs of 3. How many packs do I need to buy?
I need 47 buttons. The shop sells buttons in packs of 3. How many packs do I need to buy?
etc
9.

What is 31 add 12?
What is 3.1 add 1.2?
What is 310 add 120?
What is 310 add 12
What is 310 add 1.2
What is 25 add 14?
What is 2.5 add 1.4?
What is 250 add 140?
What is 250 add 14?
What is 250 add 1·4?
etc
10.
There are 10 buttons in a bag. The probability of taking a green button is 1/2. How many green buttons are there?
There are 18 buttons in a bag. The probability of taking a green button is 1/2. How many green buttons are there?
There are 30 buttons in a bag. The probability of taking a green button is 1/2. How many green buttons are there?
There are 12 buttons in a bag. The probability of taking a green button is 1/4. How many green buttons are there?
There are 16 buttons in a bag. The probability of taking a green button is 1/4. How many green buttons are there?
There are 40 buttons in a bag. The probability of taking a green button is 1/4. How many green buttons are there?
11.
Write the next odd number after 159.
Write the next odd number after 1598.
Write the next even number after 159.
Write the next odd number after 1598
etc
12..
What must be added to 98 to make 100?
What must be added to 73 to make 100?
What must be added to51 to make 100?
What must be added to 36 to make 100?
What must be added to 984 to make 1000?
What must be added to 735 to make 1000?
What must be added to514 to make 1000?
What must be added to 136 to make 1000?
etc
13.
What is double 7?
What is double 16?
What is double 25?
What is double 51?
What is double 89?
What is double 70?
What is double 1.6?
What is double 2.5?
What is double 5.1?
What is double 8.9?
What is double 700?
etc
14
What is half of 8?
What is half of 80?
What is half of 16?
What is half of 160?
What is half of 24?
What is half of 240?
What is half of 30?
What is half of 300?
What is half of 82?
What is half of 820?
What is half of 140?
What is half of 1400?
What is half of 10?
What is half of 1?
What is half of 30?
What is half of 3?
What is half of 50?
What is half of 5?
What is half of 70?
What is half of 7?
What is half of 90?
What is half of 9?
etc
15.

How many minutes are there in an hour?
How many minutes are there in an hour and a half?
How many minutes are there in an hour and a quarter?
How many minutes are there in an hour and 3 quarters?
How many minutes are there in an hour and 10 minutes?
How many minutes are there in an hour and 25 minutes?
How many minutes are there in 2 hours and 10 minutes?
How many minutes are there in 2 hours and 25 minutes?
etc
16.

Triangle - 3 Sides
Triangle
Square - 4 Sides
Square
Pentagon - 5 Sides
Pentagon
Hexagon - 6 sides
Hexagon
Heptagon - 7 Sides
Heptagon
Octagon - 8 Sides
Octagon
Nonagon - 9 Sides
Nonagon
Decagon - 10 Sides
Decagon
Hendecagon - 11 Sides
Hendecagon
Dodecagon - 12 Sides
Dodecagon

Draw a tick on the ... Look Up
17.


What is 12 to the 10?
What is 36 to the 10?
What is 136 to the 10?
What is 124 to the 10?
What is 1247 to the 10?
What is 5982 to the 10?
*
What is 12 to the 100?
What is 127 to the 100?
What is 612 to the 100?
What is 1229 to the 100?
What is 1,278 to the 100?
*
What is 123 to the 1000?
What is 6123 to the 1000?
What is 4168 to the 1000?
What is 41,633 to the 1000?
*

What is 1.7 to the nearest whole number?
What is 13.2 to the nearest whole number?
What is 135.5 to the nearest whole number?
What is 1333.7 to the nearest whole number?
What is 163.75 to the nearest whole number?
etc
18.
Gary saves 5p coins. He has saved 6 of them. How much money has Gary saved?
Gary saves 5p coins. He has saved 9 of them. How much money has Gary saved?
Gary saves 5p coins. He has saved 12 of them. How much money has Gary saved?
Gary saves 5p coins. He has saved 17 of them. How much money has Gary saved?
Gary saves 50p coins. He has saved 6 of them. How much money has Gary saved?
Gary saves 50p coins. He has saved 9 of them. How much money has Gary saved?
Gary saves 5p coins. He has saved 12 of them. How much money has Gary saved?
Gary saves 5p coins. He has saved 17 of them. How much money has Gary saved?
Gary saves 10p coins. He has saved 6 of them. How much money has Gary saved?
Gary saves 10p coins. He has saved 9 of them. How much money has Gary saved?
Gary saves 10p coins. He has saved 12 of them. How much money has Gary saved?
Gary saves 10p coins. He has saved 17 of them. How much money has Gary saved?
etc
19.
What is the next number in this sequence? 1, 2, 4, 8…
What is the next number in this sequence? 1, 4, 7, 10...
What is the next number in this sequence? 20, 16, 12. 8...
What is the next number in this sequence? 2, 3, 5, 8...
What is the next number in this sequence? 3, 6, 12, 24...
What is the next number in this sequence? 3, 5, 9, 17...
What is the next number in this sequence? 40, 20, 10, 5...
etc
20.
Sam thinks of a number. He says: “If I subtract 5 from it, I get 10.” What is Sam’s number?
Sam thinks of a number. He says: “If I subtract 6 from it, I get 20.” What is Sam’s number?
Sam thinks of a number. He says: “If I subtract 10 from it, I get 45.” What is Sam’s number?
Sam thinks of a number. He says: “If I subtract 13 from it, I get 16.” What is Sam’s number?
*
Sam thinks of a number. He says: “If I add 4 to it, I get 10.” What is Sam’s number?
Sam thinks of a number. He says: “If I add 9 to it, I get 29.” What is Sam’s number?
Sam thinks of a number. He says: “If I add 7 to it, I get 30.” What is Sam’s number?
Sam thinks of a number. He says: “If I add 14 to it, I get 29.” What is Sam’s number?
Sam thinks of a number. He says: “If I add 140 to it, I get 290.” What is Sam’s number?
etc
21.
What is 3 times 10?
What is 3 times 100?
What is 3 times 1000?
What is 24 times 10?
What is 24 times 100?
What is 24 times 1000?

What is 4 multiplied by 3?
What is 40 multiplied by 3?
What is 4 multiplied by 30?
What is 40 multiplied by 30?
What is 5 multiplied by 7?
What is 5 multiplied by 70?
What is 50 multiplied by 7?
What is 50 multiplied by 70?
*
What is 11 multiplied by 2?
What is 1.1 multiplied by 2?
What is 23 multiplied by 2?
What is 2.3 multiplied by 2?
What is 11 multiplied by 5 ?
What is 1.1 multiplied by 5?
What is 23 multiplied by 5?
What is 2.3 multiplied by 5?
etc
22.
How many centimetres are there in 1 metre?
How many centimetres are there in 1 and a half metres?
How many centimetres are there in 2 and a half metres?
How many centimetres are there in 1 and a quarter metres?
How many centimetres are there in 1 and three quarters metres?
*
How many centimetres are there in 2 and a quarter metres?
How many centimetres are there in 2 and three quarters metres?
*
How many centimetres are there in 1.5 metres?
How many centimetres are there in 2.5 metres?
How many centimetres are there in 1.7 metres?
How many centimetres are there in 2.7 metres?
*
23.
What is three thousand subtract 1?
What is three thousand subtract 10?
What is three thousand subtract 20?
What is three thousand subtract 75?
What is three thousand subtract 99?
What is three thousand subtract 100?
What is three thousand subtract 101?
What is three thousand subtract 500?
What is three thousand subtract 2,500?
What is three thousand subtract 2,501?
What is three thousand subtract 2,499?
24.

A television programme starts at 6:45. It lasts for 45 minutes. At what time does the programme finish?
A television programme starts at 6:45. It lasts for 1 hour. At what time does the programme finish?
A television programme starts at 6:45. It lasts for 1 hour and a half. At what time does the programme finish?
A television programme starts at 6:45. It lasts for 70 minutes. At what time does the programme finish?
A television programme starts at 6:45. It lasts for 1 hour and 3 quarters. At what time does the programme finish?
25.
The temperature starts at four degrees and goes down by four degrees. What is the temperature now?
The temperature starts at four degrees and goes down by ten degrees. What is the temperature now?
The temperature starts at four degrees and goes down by fourteen degrees. What is the temperature now?
26.
An apple costs 17 pence. How much will three cost?
An apple costs 26 pence. How much will three cost?
An apple costs 17 pence. How much will four cost?
An apple costs 17 pence. How much will five cost?
27.
What is 23 to the nearest ten?
What is 53 to the nearest hundred?
What is 253 to the nearest hundred?
What is 539 to the nearest hundred?
What is 5336 to the nearest thousand?
What is 2532 to the nearest thousand?
28.
What is four pounds add five pence add two pence?
What is six pounds add twenty-five pence add two pence?
What is fourteen pounds add thirty-five pence add seven pence?
29.
How many ten pences are there in one pound?
How many ten pences are there in two pounds?
How many twenty pences are there in one pound?
How many twenty pences are there in two pounds?
How many fifty pences are there in one pound?
How many fifty pences are there in two pounds?
How many fifty pences are there in five pounds?
30.
Which of these numbers is the smallest? 101, 110, 011, 111, 000
Which of these numbers is the smallest? 1101, 1110, 1011, 1111, 1000
Which of these numbers is the smallest? 11011, 1110, 10111, 11111, 10010
Which of these numbers is the smallest? 2424, 4422, 2442, 4242, 2244
Which of these numbers is the smallest? 24244, 44242, 24432, 42442, 22434

31.
Jodie begins school at nine o’clock. She arrives at 8:45. How many minutes early is she?
Jodie begins school at nine o’clock. She arrives at 8:30. How many minutes early is she?
Jodie begins school at nine o’clock. She arrives at 8:15. How many minutes early is she?
Jodie begins school at nine o’clock. She arrives at 8:00. How many minutes early is she?
Jodie begins school at nine o’clock. She arrives at 8:50. How many minutes early is she?
Jodie begins school at nine o’clock. She arrives at 8:36. How many minutes early is she?
Jodie begins school at nine o’clock. She arrives at 8:26. How many minutes early is she?
32.
Subtract forty from one hundred and twenty.
Subtract forty-five from one hundred and twenty.
Subtract forty-nine from one hundred and twenty.
Subtract forty-one from one hundred and twenty.
33.
A square playground has a perimeter of 16 metres. How long is one of its sides?
A square playground has a perimeter of 25 metres. How long is one of its sides?
A square playground has a perimeter of 49 metres. How long is one of its sides?
A square playground has a perimeter of 4 metres. How long is one of its sides?
A square playground has a perimeter of 100 metres. How long is one of its sides?
34.
Imagine a triangular prism. How many edges does it have?
Imagine a cube. How many edges does it have?
Imagine a cone. How many edges does it have?
 ...
35.
How would quarter past six in the evening be shown on a 24 hour digital clock?
How would quarter past six in the morning be shown on a 24 hour digital clock?
How would quarter to six in the evening be shown on a 24 hour digital clock?
How would quarter to six in the morning be shown on a 24 hour digital clock?
36.
Find the total of 99 and 101.
Find the total of 98 and 102.
Find the total of 97 and 103.
Find the total of 99 and 102.
Find the total of 98 and 101.
Find the total of 97 and 103.
Find the total of 199 and 101.
Find the total of 198 and 202.
...
37.
What is 467 centimetres to the nearest metre?
What is 289 centimetres to the nearest metre?
What is 443 centimetres to the nearest metre?
What is 201 centimetres to the nearest metre?
What is 467 metres to the nearest kilometre?
What is 289 metres to the nearest kilometre?
What is 443 metres to the nearest kilometre?
What is 43 metres to the nearest kilometre?
38.
Find the difference between 323 and 327.
Find the difference between 333 and 327.
Find the difference between 323 and 337.
Find the difference between 323 and 347.
39.
Put a ring around the coldest temperature.
9°C -37°C -12°C 12°C -2°C
92°C 37°C -12°C -12°C -2°C
92°C 37°C -12°C 12°C -2°C
-92°C 37°C -12°C 12°C -2°C
40.
How many minutes are there between 5:15pm and 6:15pm?
How many minutes are there between 5:00pm and 6:15pm?
How many minutes are there between 5:30pm and 6:15pm?
How many minutes are there between 5:45pm and 6:15pm?
How many minutes are there between 5:50pm and 6:15pm?
How many minutes are there between 5:05pm and 6:15pm?
41.
Write the number sixty-seven in figures.
Write the number three hundred and seven in figures.
Write the number three thousand, five hundred and twenty nine in figures.
Write the number sixty-seven thousand and six in figures.
(The numbers that cause more problems are the ones with zeros: 1005, 5030...)
42.
What are the values of each of the units (little vertical lines)?
0                                      10        
[___[___[___[___[___[___[___[___[___[___]
0                                      20
[___[___[___[___[___[___[___[___[___[___]
0                                      30
[___[___[___[___[___[___[___[___[___[___]
0                                    100
[___[___[___[___[___[___[___[___[___[___]
0                                    200
[___[___[___[___[___[___[___[___[___[___]
0                                        1
[___[___[___[___[___[___[___[___[___[___]
0                                        2
[___[___[___[___[___[___[___[___[___[___]
0                                        3
[___[___[___[___[___[___[___[___[___[___]
24                                     25
[___[___[___[___[___[___[___[___[___[___]
43.
Which of the next numbers is divisible by 2? 1234, 2345, 3456, 4567890
Which of the next numbers is divisible by 3? 234, 235, 346,12345
Which of the next numbers is divisible by 5? 1234, 2345, 3456, 4567890
Which of the next numbers is divisible by 10? 234, 235, 346,12345
*
Which of the next numbers is divisible by 20? 1234, 23450, 34560, 4567890
Which of the next numbers is divisible by30? 2340, 2350, 3460,123450
Which of the next numbers is divisible by50? 1234, 23450, 3456, 4567100
Which of the next numbers is divisible by100? 12340, 234500, 34560, 4567100
44.
A number multiplied by itself gives the answer 64
A number multiplied by itself gives the answer 25
A number multiplied by itself gives the answer 81
A number multiplied by itself gives the answer 1
A number multiplied by itself gives the answer 9
A number multiplied by itself gives the answer 36
A number multiplied by itself gives the answer 49
 45.
What is 25 multiplied by 2?
What is 25 multiplied by 3?
What is 25 multiplied by 4?
What is 25 multiplied by 5?
What is 25 multiplied by 6?
What is 25 multiplied by 7?
What is 25 multiplied by 8?
What is 25 multiplied by 9?
What is 25 multiplied by 20?
*
What is 0.25 multiplied by 2?
What is 0.25 multiplied by 3?
What is 0.25 multiplied by 4?
What is 0.25 multiplied by 5?
What is 0.25 multiplied by 6?
What is 0.25 multiplied by 7?
What is 0.25 multiplied by 8?
What is 0.25 multiplied by 9?
What is 0.25 multiplied by 20?
*
A doghnut costs €0.25. how much do 2 cost?
A doghnut costs €0.25. how much do 3 cost?
A doghnut costs €0.25. how much do 4 cost?
A doghnut costs €0.25. how much do 5 cost?
A doghnut costs €0.25. how much do 6 cost?
 46.
What is 50 multiplied by 2?
What is 50 multiplied by 3?
What is 50 multiplied by 4?
What is 50 multiplied by 5?
What is 50 multiplied by 6?
What is 50 multiplied by 7?
What is 50 multiplied by 8?
What is 50 multiplied by 9?
What is 50 multiplied by 20?
*

A doghnut costs €0.50. how much do 2 cost?
A doghnut costs €0.50. how much do 3 cost?
A doghnut costs €0.50. how much do 4 cost?
A doghnut costs €0.50. how much do 5 cost?
A doghnut costs €0.50. how much do 6 cost?
47.
The temperature falls from 9 degrees celsius to minus 1 degrees celsius . How many degrees does the temperature fall?
The temperature falls from 6 degrees celsius to minus 9 degrees celsius . How many degrees does the temperature fall?
 The temperature falls from 9 degrees celsius to minus 3 degrees celsius . How many degrees does the temperature fall?
 The temperature falls from 8 degrees celsius to minus 4 degrees celsius . How many degrees does the temperature fall?
 48.
How many hours are there in 1 day?
How many hours are there in 2 days?
How many hours are there in 3 days?
How many hours are there in 4 days?
*
How many hours are there in 1 day and a half?
How many hours are there in 2 days and a half?
How many hours are there in 3 days and a half?
How many hours are there in 4 days and a half?
49.
What is the total cost of a £1.00 book and a £1.00 game?
What is the total cost of a £2.00 book and a £3.00 game?
What is the total cost of a £2.40 book and a £3.30 game?
What is the total cost of a £4.70 book and a £3.20 game?
What is the total cost of a £4.70 book and a £3.30 game?
What is the total cost of a £4.70 book and a £3.50 game?
*

What is the total cost of a £11.00 book and a £1.00 game?
What is the total cost of a £12.00 book and a £3.00 game?
What is the total cost of a £12.40 book and a £3.30 game?
What is the total cost of a £24.70 book and a £3.20 game?
What is the total cost of a £24.70 book and a £3.30 game?
What is the total cost of a £24.70 book and a £3.50 game?
50.
Side A of a rectangle measures 5cm, and side B measures 10cm. What is the perimeter?
Side A of a rectangle measures 10cm, and side B measures 7cm. What is the perimeter?
Side A of a rectangle measures 5cm, and side B measures 13cm. What is the perimeter?
Side A of a rectangle measures 23cm, and side B measures 11cm. What is the perimeter?
*
The perimeter of a rectangle is 20, side A measures 3. What is the size of B?
The perimeter of a rectangle is 20, side A measures 4. What is the size of B?
The perimeter of a rectangle is 40, side A measures 5. What is the size of B?
The perimeter of a rectangle is 40, side A measures 15. What is the size of B?
51.
What fraction of 100 is 30?                                                                         30/100 is accepted, so is 3/10
What fraction of 100 is 3?
What fraction of 200 is 30?
What fraction of 200 is 3?
What fraction of 300 is 30?
What fraction of 300 is 3?
*
What fraction of one pound is thirty pence?
What fraction of one pound is three pence?
What fraction of two pounds is thirty pence?
What fraction of two pounds is three pence?
What fraction of three pounds is thirty pence?
What fraction of three pounds is three pence?
*
What fraction of  €7.50 is thirty pence?                                                      30/750 is accepted
What fraction of  €7.33 is €1.25 pence?
52.
What is 10% of £1?
What is 20% of £1?
What is 30% of £1?
What is 10% of £2?
What is 20% of £2?
What is 30% of £2?
*
What is 10% of £10?
What is 20% of £10?
What is 30% of £10?
What is 10% of £20?
What is 20% of £20?
What is 30% of £20?
53.
How many seconds are there in 1 minute?
How many seconds are there in 2 minutes?
How many seconds are there in 3 minutes?
How many seconds are there in 4 minutes?
How many seconds are there in 5 minutes?
*
How many seconds are there in half a minute?
How many seconds are there in 1 minute and a half?
How many seconds are there in 2 minutes and a half?
How many seconds are there in 3 minutes and a half?
How many seconds are there in 4 minutes and a half?
How many seconds are there in 5 minutes and a half?
 54.
Estimate the size of these accute angles. Get a protractor and check. We allow a +5º and -5º error.

Estimate the size of these accute angles. Get a protractor and check. We allow a +5º and -5º error.
*
Now create your own obtuse angles. Click here for an explanation, and here for some examples. 
*
Now create your own reflex angles. Click here for an explanation, and here for some examples.
54.
It costs 10p for a child to swim. How much does it cost for 6 children to swim?
It costs 20p for a child to swim. How much does it cost for 6 children to swim?
It costs 30p for a child to swim. How much does it cost for 6 children to swim?
It costs 40p for a child to swim. How much does it cost for 6 children to swim?

TO BE CONTINUED...