New
New
Year 1

# Halve numbers and explain what halving means

I can halve numbers and explain what halving means.

New
New
Year 1

# Halve numbers and explain what halving means

I can halve numbers and explain what halving means.

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## Lesson details

### Key learning points

1. Halving is the inverse of doubling.
2. Halving can be used to subtract a number from its double.

### Common misconception

Children may struggle to see that halving is the inverse of doubling.

Only progress to this lesson once children are fluent in doubling numbers zero to five. Present the same visual (e.g. 3 apples + 3 apples) and use this to discuss doubling and halving, revealing and covering one of the two equal parts each time.

### Keywords

• Half - One of two equal parts of a whole.

• Halving - To divide into two equal parts.

• Doubling - To become twice as many.

• Inverse - The opposite in effect.

### 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.
How many cubes are needed on the other side to make this equal?
Correct Answer: An image in a quiz
Q2.
What doubling equation is being shown on this seesaw?
3 + 3 = 6
2 + 2 = 4
Correct answer: 1 + 1 = 2
Q3.
What doubling fact is being shown here?
4 + 4 = 8
Correct answer: 3 + 3 = 6
2 + 4 = 6
2 + 2 = 4
Q4.
Which of these part part whole models, would have a missing part of 5?
Correct Answer: An image in a quiz
Q5.
Match the equation to the correct explanation.
Correct Answer:1 + 1 = 2,Double 1 is 2

Double 1 is 2

Correct Answer: 4 + 4 = 8,Double 4 is 8

Double 4 is 8

Correct Answer:3 + 3 = 6,3 plus 3 equals 6

3 plus 3 equals 6

Q6.
Sam makes a tower that uses double the number of cubes than the one below. How many cubes tall is Sam's tower?

## Exit quiz

### 6 Questions

Q1.
How many cubes are needed on the other side to make this equal?
2
3
5
Q2.
Tick all the correct statements.
Correct answer: 2 + 2 = 4
Double 4 is 2
Correct answer: Double 2 is 4 so half of 4 is 2
half of 2 is 4
Q3.
What is the missing part in this part-part-whole model?
5
6
4
Q4.
What number would complete this bar model?
2
3
4
Q5.
Match the equation to the inverse.
Correct Answer: 4 + 4 = 8,8 - 4 = 4

8 - 4 = 4

Correct Answer:1 + 1 = 2,2 - 1 = 1

2 - 1 = 1

Correct Answer:5 + 5 = 10,10 - 5 = 5

10 - 5 = 5

Q6.
Sam baked half the number of cakes as Jacob. Jacob baked 4 cakes. How many cakes did Sam bake?