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Year 1

Halve numbers and explain what halving means

I can halve numbers and explain what halving means.

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New
New
Year 1

Halve numbers and explain what halving means

I can halve numbers and explain what halving means.

Download all resources
Share activities with pupils

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.

Here, halving is understood within the context of a subtraction problem, where the subtrahend is half of the minuend. Show related visuals and equations alongside each other so that children are able to make links in the way they have with addition and subtraction.
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).

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Starter quiz

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6 Questions

Q1.
How many cubes are needed on the other side to make this equal?
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
Q2.
What doubling equation is being shown on this seesaw?
An image in a quiz
3 + 3 = 6
2 + 2 = 4
Correct answer: 1 + 1 = 2
Q3.
What doubling fact is being shown here?
An image in a quiz
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
An image in a quiz
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?
An image in a quiz
Correct Answer: 6, six

Exit quiz

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6 Questions

Q1.
How many cubes are needed on the other side to make this equal?
An image in a quiz
2
3
Correct answer: 4
5
Q2.
Tick all the correct statements.
An image in a quiz
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?
An image in a quiz
5
6
4
Correct answer: 3
Q4.
What number would complete this bar model?
An image in a quiz
Correct answer: 1
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?
Correct Answer: 8, eight

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