New
New
Year 1

# Find the missing part in addition and subtraction stories

I can solve addition and subtraction stories where the ‘end’ of the story is missing.

New
New
Year 1

# Find the missing part in addition and subtraction stories

I can solve addition and subtraction stories where the ‘end’ of the story is missing.

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## Slide deck

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## Lesson details

### Key learning points

1. The more that is added to an amount at the start of an addition, the greater the amount at the end of the story will be.
2. The more that is subtracted from the amount at the start of a subtraction, the smaller the amount at the end will be.

### Common misconception

Children may not have yet formed generalisations about the increase or decrease that takes place when numbers are added or subtracted, so may predict answers that are not logical or possible.

Encourage children to generalise by posing errors to reason about, encouraging predictions about what will happen to the size of amounts when adding and subtracting. Encourage use of practical equipment to demonstrate their explanations.

### Keywords

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

• Subtract - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.

### 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).

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## Worksheet

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## Starter quiz

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### 6 Questions

Q1.
Which equation correctly represents the story? First, there were 6 stickers in my books. Then, I put some more in my book. Now, there are 9 stickers in my book.
___ + 6 = 9
Correct answer: 6 + ___ = 9
6 + 9 = ___
Q2.
Use the picture to help you complete the missing number equation. ___ + 2 = 6
2
6
Correct answer: 4
Q3.
Which tens frame shows the missing first part of this story?
Y1.U10.L7.S3.2
Correct answer: Y1.U10.L7.S3.3
Y1.U10.L7.S3.4
Q4.
At the start of the story, there was 1 egg in the egg box. At the end of the story, there were 6 eggs in the egg box. How many eggs were added?
Correct Answer: 5, five, 5 eggs
Q5.
Which equation represents the story and shows the missing part? We don't know how many pencils were in the pot at first. Then, 3 pencils were added. Now, there are 7 pencils in the pot.
Correct answer: 4 + 3 = 7
3 + 4 = 7
7 + 3 = 10
Q6.
Sam writes this equation to represent his story. 5 + ___ = 8 First, there were 5 cats on a wall. Then, ___ cats jumped onto the wall. Now, there are 8 cats on the wall. What is the missing addend?
8
Correct answer: 3
5

## Exit quiz

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### 6 Questions

Q1.
First, I had 3 coins in my piggy bank. Then, I saved another 6 coins. How many coins do I have in my piggy bank now?
Correct answer: 9
7
8
Q2.
First, I had 5 counters on my tens frame. Then, 5 counters were added. Now, there are ___ counters on my tens frame.
Correct Answer: An image in a quiz
Q3.
If the sum of my problem is 8, which of these equations could show the addends?
Correct answer: 1 + 7 =
3 + 6 =
Correct answer: 4 + 4 =
Q4.
How many counters will be on the tens frame at the end of this subtraction story?
Correct Answer: 6
Q5.
Which of these numbers, if subtracted from the amount at the start of this story, would leave the smallest amount at the end?
6
Correct answer: 7
2
Q6.
Write an equation for this 'First, then, now' story.
7 - 3 = 4
Correct answer: 7 - 4 = 3
7 + 4 = 3