  ### Comprehensive & curriculum aligned

In this worksheet, students must understand that addition can be done in any order but subtraction cannot. Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Understand Order for Addition/Subtraction

Difficulty level:   #### Worksheet Overview

Notice that:

6 + 5 = 11    and    5 + 6 = 11

7 + 2 = 9    and    2 + 7 = 9

8 + 13 = 21    and    13 + 8 = 21

28 + 59 = 87    and    59 + 28 = 87

ADDING can be done in any order.

You always get the same answer.

*****WARNING*****

SUBTRACTING is different.

28 - 19 = 9    but    19 - 28 = -9

They are NOT the same.

SUBTRACTING cannot be done in any order.

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