New
New
Year 1

# Find the missing part of an addition story

I can find the missing part of a ‘First, then, now’ addition story.

New
New
Year 1

# Find the missing part of an addition story

I can find the missing part of a ‘First, then, now’ addition story.

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## Lesson details

### Key learning points

1. When we know two parts of a ‘First, then, now’ story, we can find the missing part.

### Common misconception

Children may add the parts instead of subtracting a part to find the missing amount.

Give plenty of opportunities to act out stories and solve problems with practical objects. Encourage children to think about the size of the missing part in relation to the known parts, i.e. whether it will be larger or smaller than the other parts.

### Keywords

• First - Before anything else

• Then - After something in time.

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

• Increased - Make something larger / greater (in size or quantity).

Offer children additional examples to represent and solve using counters/cubes or tens frames and allow them to match stories to equations and equations to stories, justifying their choices each time.
Teacher tip

### 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.
Match the numbers on the bar model to what they represent.

part

whole

part

Q2.
Look at this equation. 10 = 4 + 6 Which numbers are addends?
10
Q3.
Match the number or symbol to the correct description of what it represents.

number of cold drinks

the addends combine to make the whole

number of hot drinks

Q4.
What equation does this picture represent?
Correct answer: 4 + 3 = 7
4 - 3 = 1
Correct answer: 3 + 4 = 7
Q5.
At the start of the story, there are 6 books on the shelf. At the end of the story, there are 8 books on the shelf. How many books were added?
Q6.
At the start of the story, there were 9 cakes on a plate. At the end of the story, there were 6 cakes on the plate. How many cakes were eaten?

## Exit quiz

### 6 Questions

Q1.
Which representation would match this addition story? First, there were 2 pencils in the pot. Then, 7 pencils were put back in. Now, there are 9 pencils in the pot.
Correct Answer: An image in a quiz
Q2.
What is missing from this equation?
9
12
Q3.
Which tens frame shows the missing 'first' part of this story?
a
c
Q4.
At the start of the story, there were 6 coins. At the end of the story, there were 8 coins. How many coins were added to the piggy bank?
Correct Answer: 2, 2 coins , two
Q5.
Which equation represents this story? At the start of the story, there were 3 cookies on the plate. At the end of the story, there were 7 cookies on the plate.
3 + 7 = 10
Correct answer: 3 + 4 = 7
4 + 3 = 7
Q6.
Who has solved this problem correctly?
Alex
Aisha