Mental Strategies

Question 1

What is the mathematical term for ‘sum’?

Answer 1

add

Question 2

What is the mathematical term for ‘difference’?

Answer 2

subtract

Question 3

What is the mathematical term for ‘product’?

Answer 3

multiply

Question 4

What is the mathematical term for ‘share’?

Answer 4

divide

Question 5

What does ‘total’ mean in mathematical terms?

Answer 5

add up all the numbers

Question 6

What is meant by ‘double’ in mathematics?

Answer 6

multiply by 2

Question 7

What does ‘treble’ mean?

Answer 7

multiply by 3

Question 8

What is the meaning of ‘halve’?

Answer 8

divide by 2

Question 9

What is a shortcut for multiplying by a number ending in 9?

Answer 9

round the number up to the nearest 10, multiply by the rounded number, then subtract the unrounded number

Question 10

When adding, what should you look for?

Answer 10

pairs of numbers that make 1, 10, 100, etc.

Question 11

True or False: Addition is commutative.

Answer 11

True

Question 12

What is a method for dividing by 4?

Answer 12

halve, then halve again

Question 13

What is a method for dividing by 8?

Answer 13

halve, then halve again, then halve again

Question 14

How can you divide by 5?

Answer 14

double the number then divide by 10

Question 15

Calculate 0.3 × 30.

Answer 15

9

Question 16

Calculate 40 ÷ 63.

Answer 16

40 ÷ 63

Question 17

Calculate 4% of 820.

Answer 17

32.8

Question 18

What does BIDMAS stand for?

Answer 18

Brackets, Indices, Division and multiplication, Subtraction

Question 19

Calculate 2x3 - 20 ÷ (1 + 3).

Answer 19

19

Question 20

Find the sum of 28.7 and 33.6.

Answer 20

62.3

Question 21

What is double of 79?

Answer 21

158

Question 22

Find the product of 2.5 and 8.

Answer 22

20

Question 23

Share $14.25 between 5 people, how much does each get?

Answer 23

$2.85

Question 24

What is treble of 59?

Answer 24

177

Question 25

Calculate $2.84 ÷ 4.

Answer 25

$0.71

Question 26

What is 63 × 19?

Answer 26

1197

Question 27

Calculate 3400 ÷ 8.

Answer 27

425

Question 28

Calculate 24.6 + 37.9 + 75.4.

Answer 28

137.9

Question 29

What is $73.25 ÷ 5?

Answer 29

$14.65

Question 30

Calculate 0.8 ÷ 200.

Answer 30

0.004

Question 31

Calculate 60 ÷ 4.

Answer 31

15

Question 32

What is 3% of 320?

Answer 32

9.6

Question 33

Calculate 33 x 18 ÷ (6 + 3).

Answer 33

66

Question 34

Calculate 50 - 5 × 15.

Answer 34

-25

Question 35

Calculate 40 - 40 ÷ 4 + 72.

Answer 35

72

Question 36

Calculate 2.9 + 1.1.

Answer 36

4