In year Four, the second year in KS2, children will be exposed to more difficult addition and subtraction problems in Maths, such as four figure numbers or negatives. They will however be taught the best methods to use to work out the answers to these problems.

Addition and subtraction is adding numbers together or taking them away from each other. Knowing how to work out addition and subtraction problems comes in very handy when dealing with money in everyday life. Imagine that you have £10 and wish to buy two items that cost £3.47 and £6.91... do you have enough money? Well, £3.47 + £6.91 = £10.38 so you'd be 38p short! See how important it is to be able to add and subtract?

Test your knowledge of addition and subtraction by playing the following Year Four quiz.

1.

If we subtract a large number from a small number the total will be?

A fraction

A decimal

A multiple

A negative number

e.g. 8 - 10 = -2

2.

Which number sentence is incorrect?

28 + 35 = 63

63 - 35 = 28

35 + 28 = 63

28 - 35 = 63

The other correct number sentence would be 63 - 28 = 35

3.

What is double 47?

84

87

92

94

40 x 2 = 80 and 7 x 2 = 14

80 + 14 = 94

80 + 14 = 94

4.

What is the missing number in 350 + ___ = 1,000?

450

550

650

750

100 - 35 = 65

so 1,000 - 350 = 650

so 1,000 - 350 = 650

5.

What would we add to 56 to total 100?

44

45

54

64

100 - 56 = 44

6.

What is the best method of subtracting 21?

Add 20 subtract 1

Subtract 20 add 1

Add 20 add 1

Subtract 20 subtract 1

e.g. 56 - 21 so:

56 - 20 = 36

then 36 - 1 = 35

56 - 20 = 36

then 36 - 1 = 35

7.

What is the sum of 37 + 28?

9

63

65

75

Add the 10s first and then the units

30 + 20 = 50

then 7 + 8 = 15

then 50 + 15

30 + 20 = 50

then 7 + 8 = 15

then 50 + 15

8.

Which is the best strategy to calculate 38 + 37?

Count on 37 from 38

Double 38 and subtract 1

Add 50 to 38 then subtract 13

Multiply 38 by 3 subtract 39

2 x 8 = 16 and 2 x 30 = 60

60 + 16 = 76

76 - 1 = 75

60 + 16 = 76

76 - 1 = 75

9.

Which is a good strategy for adding 19?

Add 20 and take away 11

Add 20 and take away 1

Take away 20 add 1

Take away 20 add 11

e.g. 46 + 19 so:

46 + 20 = 66

then 66 - 1 = 65

46 + 20 = 66

then 66 - 1 = 65

10.

Which strategy would be best to calculate 827 + 6?

Add 20 to 827 then subtract 14

Add 3 to 827 to make 830 then add 3

Count 827 on from 6

Subtract 10 from 827 then add 4

Most maths problems can be made simpler