New
New
Year 1

# Find the difference between consecutive numbers

I can recognise and use consecutive numbers.

New
New
Year 1

# Find the difference between consecutive numbers

I can recognise and use consecutive numbers.

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## Lesson details

### Key learning points

1. In a subtraction equation, when the subtrahend is one less than the minuend, all except one is subtracted.
2. Numbers that are one more or one less than each other are called consecutive numbers.
3. Consecutive numbers have a difference of one.
4. Spotting consecutive numbers in subtraction equations can help us to solve equations more quickly.

### Common misconception

Children may resort to counting strategies to find the difference e.g. counting back four from five to solve 5 - 4

Always make a clear link between 'all except one' object leaving, and the subtrahend being one less than the minuend.

### Keywords

• Difference - The result of subtracting one number from another.

• One less - The number before a given number is one less than it.

• Consecutive - Numbers which follow each other in order, without gaps.

### 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 equation to the total.
Correct Answer:One more than 5 is,6

6

Correct Answer:One more than 8 is,9

9

Correct Answer:One more than 4 is,5

5

Correct Answer:One more than 9 is,10

10

Q2.
Match the equation to the answer.
Correct Answer:One less than 3 is,2

2

Correct Answer:One less than 6 is,5

5

Correct Answer:One less than 9 is,8

8

Correct Answer:One less than 7 is,6

6

Q3.
Addition is commutative. Which equations have the same sum?
Correct Answer:1 + 6,6 + 1

6 + 1

Correct Answer:9 + 1,1 + 9

1 + 9

Correct Answer:3 + 1,1 + 3

1 + 3

Correct Answer:2 + 8,8 + 2

8 + 2

Q4.
Match the equation to the answer.

9

6

5

8

Q5.
Jacob has one pound. He needs five pounds to buy a new book. How many more pounds does he need?
Q6.
First, Sam has 10 cherries. Then, she eats some of the cherries. Now, she has one cherry left. How many cherries did she eat?

## Exit quiz

### 6 Questions

Q1.
True or false. 4 and 5 are consecutive numbers.
False
Q2.
4 is the consecutive number before 5 What is the consecutive number after 5?
Q3.
What is the missing subtrahend?
Q4.
What is the missing subtrahend in this equation? 8 - = 1
6
1
Q5.
Which equation shows that consecutive numbers have a difference of 1?
4 + 2 = 6
1 + 5 = 6
6 - 3 = 3
Correct answer: 7 - 6 = 1
Q6.
I had 6 cakes. Now, there is 1 cake left. How many cakes have been eaten? Which bar model represents this problem?
Correct Answer: An image in a quiz