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# 1.14 Addition and subtraction: two-digit numbers and multiples of ten

Created on 08 March 2018 by ncetm_administrator
Updated on 09 March 2018 by ncetm_administrator

## Introduction

Explore counting on, and back, in ten from any two-digit number; apply number facts within ten to the addition and subtraction of multiples of ten.

## Teaching points

• Teaching point 1: When finding ten more or ten less than any two-digit number, the ones digit does not change.

• Teaching point 2: When ten is added or subtracted to/from a two-digit number, the tens digit changes and the ones digit stays the same.

• Teaching point 3: Knowledge of number facts within ten can be applied to adding or subtracting multiples of ten to/from a two-digit number.

• Teaching point 4: Two-digit numbers can be partitioned in different ways.

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