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# 1.8 Composition of numbers: multiples of 10 up to 100

Created on 31 July 2017 by ncetm_administrator
Updated on 16 January 2018 by ncetm_administrator

## Introduction

Explore multiples of ten, including counting in tens to 100; apply number facts within ten to addition and subtraction for multiples of ten.

## Teaching points

• Teaching point 1: One ten is equivalent to ten ones.

• Teaching point 2: Multiples of ten can be represented using their names or using numerals. We can count in multiples of ten.

• Teaching point 3: Knowledge of the 0–10 number line can be used to estimate the position of multiples of ten on a 0–100 number line.

• Teaching point 4: Adding ten to a multiple of ten gives the next multiple of ten; subtracting ten from a multiple of ten gives the previous multiple of ten.

• Teaching point 5: Known facts for the numbers within ten can be used to add and subtract in multiples of ten by unitising.

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