New
New
Year 1

# Find the missing part of a subtraction story

I can find the missing part of a subtraction story when the other two parts are known.

New
New
Year 1

# Find the missing part of a subtraction story

I can find the missing part of a subtraction story when the other two parts are known.

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## Lesson details

### Key learning points

1. When an amount is changed by subtracting, to undo the change, we must add the same amount back on.
2. The amount that has been subtracted can be found using the known parts.

### Common misconception

On recognising the subtraction symbol, children may believe that the two parts known must be subtracted from each other, regardless of which part of the equation is missing.

Use practical equipment on 'First, then, now' boards and on part-part-whole models to demonstrate additive relationships and encourage them to use their number sense to think about and predict plausible answers.

### Keywords

• Add - To find the total, or sum, by combining two or more parts, or to increase an amount by adding another.

• Subtract - To partition one part from another, or to decrease an amount by taking an amount away.

• Then - After something in time.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
Use the picture to tell the story. Which amount will be at the end of the story?
3
8
Q2.
Look at the picture. If you wrote an equation, which number would represent the sum?
9
5
Q3.
Match each pair of addends to the correct sum.

6

7

8

Q4.
Use the picture to tell the story and find out how many balls were left at the end of the story.
8
11
Q5.
Listen to story and choose the equation that would represent it. First, there were 7 birds on the branch. Then, 2 birds flew away. Now there are ___ birds on the branch.
7 + 2 = 9
7 - 5 = 2
Correct answer: 7 - 2 = 5
Q6.
Solve each equation and match to the correct answer.

6

5

4

## Exit quiz

### 6 Questions

Q1.
Which tens frame represents the starting amount in this subtraction story?
Correct Answer: An image in a quiz
Q2.
What amount is missing from this equation? Use the picture to help.
Q3.
Which equation represents this 'First, then, now' story?
4 + 5 = 9
Correct answer: 9 − 4 = 5
9 − 5 = 4
Q4.
There were some books on a book shelf. Then, 4 books fell off. Now, there are 6 books on the shelf. How many books were on the shelf at the start of the story?