New
New
Year 1

# Understand the relationship between addition and subtraction

I can represent both addition and subtraction and understand the link between them.

New
New
Year 1

# Understand the relationship between addition and subtraction

I can represent both addition and subtraction and understand the link between them.

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## Lesson details

### Key learning points

1. In problems, if the whole and one part of the whole are known, subtraction can be used to find the missing part.
2. This can be represented using a subtraction equation.
3. In problems, if the parts are known, they can be combined using addition to find the whole.
4. This can be represented using an addition equation.

### Common misconception

The terms minuend, subtrahend and difference may be difficult if only used occasionally.

Ensure the terms are used by the teacher throughout lessons and encourage children to use them when explaining their thinking.

### Keywords

• Subtraction - To separate or take away one number from another, or to decrease an amount.

• Addition - To find the total, or sum, by combining two or more numbers (addends).

Discuss the partitioning structure of subtraction in terms of one part having a characteristic and one part not having that characteristic to avoid children becoming confused if the whole group does not have two clearly identifiable parts.
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.
Which bar model has a whole of 5?
Correct Answer: An image in a quiz
Q2.
Which bar model represents this story? I have 6 pennies in my two pockets. 3 pennies are in one pocket. How many are in the other pocket?
Correct Answer: An image in a quiz
Q3.
Which equation could represent the bar model?
6 - 1 = 7
Correct answer: 7 - 6 = 1
Correct answer: 7 - 1 = 6
Q4.
Find the missing number in the bar model.
Q5.
Which subtraction equation could this bar model could represent?
5 - 3 = 8
Correct answer: 8 - 5 = 3
Correct answer: 8 - 3 = 5
3 - 8 = 5
Q6.
Which equations could not be represented by this bar model?
10 - ? = 7
Correct answer: 7 - ? = 10
10 - 7 = ?

## Exit quiz

### 6 Questions

Q1.
Which counters could represent this equation? 3 + 5 = 8
Correct Answer: An image in a quiz
Q2.
Which addition equation could represent the counters?
Correct answer: 3 + 4 = 7
7 + 3 = 4
4 + 7 = 3
Q3.
Which counters could represent this equation? 8 – 3 = 5
Correct Answer: An image in a quiz
Q4.
5 + 2 = 3
Correct answer: 5 - 2 = 3
3 - 2 = 5
Correct answer: 2 + 3 = 5
Q5.
Jun writes this subtraction equation to match this picture. 6 - 2 = 4 What addition equation could he write?
6 - 4 = 2
Correct answer: 4 + 2 = 6
6 + 2 = 4
2 + 6 = 4
Q6.
Jun uses different coloured counters to represent the two parts in a story. He uses 4 red counters and 6 white counters. Which equations could represent this?
6 - 4 = 2
Correct answer: 10 - 4 = 6
10 - 2 = 8
Correct answer: 4 + 6 = 10