New
New
Year 1

# Interpret and represent subtraction stories

I can interpret and represent subtraction stories that involve decreasing an amount using the ‘First, then, now’ structure.

New
New
Year 1

# Interpret and represent subtraction stories

I can interpret and represent subtraction stories that involve decreasing an amount using the ‘First, then, now’ structure.

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## Lesson details

### Key learning points

1. In a ‘First, then, now’ subtraction story, the number at the start of the story is decreased by subtracting a part.
2. When using subtraction to decrease an amount, the number that is decreased must always be represented first.
3. This can be represented with practical equipment and as a bar model or a number line.
4. We can write an equation to match these representations.

### Common misconception

The change in amount during the 'then' part of the story may be hard to identify.

Draw attention to explicitly to the change, talking about it as a decrease.

### Keywords

• First - Before anything else.

• Then - After something in time.

• Now - At the present time.

• Decrease - To make something smaller in size or quantity.

### 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.
Alex writes an equation to match this story. 7 - 2 = 5 What does the 5 represent?
Correct answer: The amount left at the end of the story.
The amount at the start of the story.
The amount subtracted
Q2.
Which story could match the picture?
Correct answer: First, there were 5 pencils. Then, I took 2 pencils. Now, there are 3 pencils.
First, there were 3 pencils. Then, I put in 2 pencils. Now, there are 5 pencils.
First, there were 5 pencils. Then, I took 3 pencils. Now, there are 2 pencils.
Q3.
Which set of counters would represent this story? First, there were 8 pounds in my pocket. Then, I spent 3 pounds. Now, there are 5 pounds in my pocket.
Correct Answer: An image in a quiz
Q4.
Which equation matches the picture?
5 + 1 = 6
6 - 5 = 1
Correct answer: 6 - 1 = 5
Q5.
Which equation matches the story? First, there were 8 books on a shelf. Then, 2 books were taken off. Now, there are 6 books on the shelf.
8 - 6 = 2
8 = 2 + 6
Correct answer: 8 - 2 = 6
Q6.
Write an equation to match the story. First, there were 10 pebbles in my bucket. Then, I dropped 2 pebbles. Now, there are 8 pebbles in my bucket.
Correct Answer: 10-2=8, 10 - 2 = 8

## Exit quiz

### 6 Questions

Q1.
Which picture could represent this story? First, there were 7 cats on the wall. Then, 3 cats jumped off the wall. Now, there are 4 cats on the wall.
Correct Answer: An image in a quiz
Correct Answer: An image in a quiz
Q2.
Which equation would represent this story?
Correct answer: 8 - 3 = 5
8 - 5 = 3
5 - 3 = 2
Q3.
What is the subtrahend in this problem?
5
0
Q4.
Which 'First, then, now' story represents this bar model?
First, there were 9 cars. Then, 1 car left. Now, there are 8 cars.
Correct answer: First, there were 5 cars, Then, 1 car left. Now, there are 4 cars.
First, there were 4 cars. Then, 1 car left. Now, there are 5 cars.
Q5.
Match the story to the equation it represents.
Correct Answer:2 - 2 = 0,First, there were 2 dogs. Then, 2 dogs left. Now, there are 0 dogs.

First, there were 2 dogs. Then, 2 dogs left. Now, there are 0 dogs.

Correct Answer:9 - 1 = 8,First, there were 9 cats. Then, 1 cat left. Now, there are 8 cats.

First, there were 9 cats. Then, 1 cat left. Now, there are 8 cats.

Correct Answer:6 - 3 = 3,First, there were 6 pigs. Then, 3 pigs left. Now, there are 3 pigs.

First, there were 6 pigs. Then, 3 pigs left. Now, there are 3 pigs.

Q6.
Which of these equations has been shown on this number line?
Correct answer: 8 - 6 = 2
8 - 2 = 6
6 - 2 = 8