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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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