FRIENDLY NUMBERS

Round numbers to make them friendlier, then adjust. Mental maths made easy.

L3L4

CS.N.2.3·Performing addition and subtraction 0–1000(II)CS.N.3.2·Using calculation techniques with numbers 0–10000(III)

Section 1 / 3

ROUNDING TO FRIENDLY NUMBERS

A friendly number is one that is easy to work with - usually a multiple of 10. To add using friendly numbers, round one number up to the nearest ten, add, then subtract the extra you added.

38 + 25

1Round 38 up to 40 (add 2)

240 + 25 = 65

3Subtract the 2 you added: 65 − 2 = 63

= 63

LEADER TIP

Encourage children to ask 'What is the nearest ten?' before adding. This builds flexible thinking about numbers.

BEFORE THIS LESSON, TRY

Making Ten

PRACTICE WITH THESE GAMES

Timed Addition

Quick Calculate

Math Sprint

Want more practice? Generate printable worksheets with similar problems.

Go to Worksheets

CONTINUE WITH:

Compensation Strategy

Mental Addition

FRIENDLY NUMBERS

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FRIENDLY NUMBERS