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Double 47 is 94.

Addition and Subtraction (Year 4)

In Year 4 maths, pupils strengthen their addition and subtraction skills. They explore quicker methods and build confidence solving number problems with larger values.

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Fascinating Fact:

A quick way to subtract 99 is to subtract 100 and then add 1 back. For example, 487 - 99 = 388. Another way to show it is 487 - 100 = 387, then 387 + 1 = 388.

In KS2 Maths, Year 4 pupils work with bigger numbers and learn new techniques to check their answers. These strategies make calculations quicker and more reliable.

Key Terms

Column Method: A written layout for adding or subtracting numbers in columns.
Estimation: Rounding numbers to quickly check if an answer is sensible.
Inverse Operation: An opposite operation, such as subtraction being the inverse of addition.

Frequently Asked Questions (Click to see answers)

How can I subtract large numbers quickly?

You can use tricks like subtracting 100 and adding 1 for 99, or use the column method to keep numbers organised and accurate.

Why do we use estimation in maths?

Estimation helps check if an answer is reasonable. It gives a quick idea of the size of the result without doing the full calculation.

How can addition help me check subtraction?

You can use addition as the inverse of subtraction. For example, if 452 ? 178 = 274, then 274 + 178 should equal 452.

Try These Related Quizzes

1 .

What would we add to 56 to total 100?

100 - 56 = 44

2 .

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

3 .

What is double 47?

40 x 2 = 80 and 7 x 2 = 14
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

5 .

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

6 .

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

7 .

What is the sum of 37 + 28?

Add the 10s first and then the units
30 + 20 = 50
then 7 + 8 = 15
then 50 + 15

8 .

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

9 .

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

10 .

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

You can find more about this topic by visiting BBC Bitesize - Adding and subtracting

Author: Amanda Swift (Primary School Teacher & Educational Content Developer)

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