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Year 2

Explain how doubling and halving are related

I can explain how doubling and halving are related.

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New
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Year 2

Explain how doubling and halving are related

I can explain how doubling and halving are related.

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Lesson details

Key learning points

  1. If double 4 is 8, then half of 8 is 4
  2. Halving means to partition the number into two equal groups.
  3. Halving is the inverse of doubling.
  4. Whether doubling or halving, we can also see these as our 2 times tables facts.

Keywords

  • Double / Doubling - To become twice as many / to multiply by two.

  • Half / Halving - One of two equal parts of a whole. To divide into two equal parts.

Common misconception

Children may inaccurately recall related doubling facts to solve halving problems.

Represent each problem as a bar model (as the whole and two equal parts) before solving. Encourage children to check that the two equal parts are equal to the whole.


To help you plan your year 2 maths lesson on: Explain how doubling and halving are related, download all teaching resources for free and adapt to suit your pupils' needs...

Use the stem sentence, 'If I know ..., then I know ...' to help children see how doubling facts can help solve halving problems. Ensure children are encouraged to use this stem sentence when talking through their approach to a problem.
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Licence

This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Lesson video

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6 Questions

Q1.
Which double is being shown here?
An image in a quiz
Correct answer: Double 6
Double 4
Double 5
Q2.
Double 3 tens is ___
An image in a quiz
6
16
Correct answer: 60
Q3.
Double 12 is
Correct Answer: 24
Q4.
Double 40 is
Correct Answer: 80
Q5.
Which of these equations could I use doubling knowledge to solve?
Correct answer: 2 × 6 = ?
Correct answer: 4 × 2 = ?
4 + 2 = ?
Q6.
What is 14 × 2 = ?
Correct Answer: 28

6 Questions

Q1.
Use the bar model to complete the sentence. Half of 8 is equal to
An image in a quiz
Correct Answer: 4, four
Q2.
If I know that half of 6 is equal to 3, then I know that _____________
double 4 is equal to 8
Correct answer: double 3 is equal to 6
double 2 is equal to 4
Q3.
Which facts are represented by this bar model?
An image in a quiz
Double 4 is equal to 8
Correct answer: Double 2 is equal to 4
Half of 6 is equal to 3
Correct answer: Half of 4 is equal to 2
Q4.
Which equation is represented by this bar model?
An image in a quiz
2 × 3 = 6
Correct answer: 2 × 5 = 10
2 × 4 = 8
Q5.
Alex had 4 marbles. He gave half to Jacob. How many marbles did Jacob get? marbles
Correct Answer: 2, two
Q6.
Aisha gave half of her biscuits to Alex. Aisha was left with 6 biscuits. How many biscuits did Aisha have to begin with? biscuits
Correct Answer: 12, twelve