# Solve Addition and Subtraction Problems Using Partitioning

In this worksheet, students will use partitioning to solve addition and subtraction problems

Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Solve Add/Subtract Problems to 100

Difficulty level:

#### Worksheet Overview

In this activity, we are going to look at using the written method of partitioning to help us solve addition and subtraction questions.

Example 1

32 + 12 =

Let's have a look at a written method called partitioning to help us solve this.

Let's partition each number into tens and ones.

32 = 30 + 2

12 = 10 + 2

We can use TOT to help us work it out. First, we add the tens, then we add the ones and then we add them both together to find the total:

Tens: 30 + 10 = 40

Ones: 2 + 2 = 4

Total: 40 + 4 = 44

Example 2

Using partitioning for subtraction is a little bit different.

Let's have a look at how to solve this:

48 - 12 =

This time, we only partition the number that we are taking away.

12 = 10 + 2

We start with 48 and take away the tens from 12 which is 10.

48 - 10 = 38

This gives us 38, so we take 38 and take away the ones from 12 which is 2.

38 - 2 = 36

And there we have our answer.

Go and grab yourself a pencil and paper and you can use this written method to answer these questions.

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