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# 1.22 Composition and calculation: 1,000 and four-digit numbers

Created on 31 August 2018 by ncetm_administrator
Updated on 26 November 2018 by ncetm_administrator

## Introduction

Explore the composition of 1,000 and four-digit numbers, using the partitioning structure, and make links to measures; introduce children to calculation across thousands boundaries, and extend column algorithms and rounding to four-digit numbers.

## Teaching points

• Teaching point 1: Ten hundreds make 1,000, which can also be decomposed into 100 tens and 1,000 ones.

• Teaching point 2: When multiples of 100 are added or subtracted, the sum or difference is always a multiple of 100.

• Teaching point 3: Numbers over 1,000 have a structure that relates to their size. This means they can be ordered, composed and decomposed.

• Teaching point 4: Numbers can be rounded to simplify calculations or to indicate approximate sizes.

• Teaching point 5: Calculation approaches learnt for three-digit numbers can be applied to four-digit numbers.

• Teaching point 6: 1,000 can also be composed multiplicatively from 500s, 250s or 200s, units that are commonly used in graphing and measures.

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