Halve numbers and explain what halving means | Maths | Quizalize & Oak National Academy

Starter quiz

How many cubes are needed on the other side to make this equal?
What doubling equation is being shown on this seesaw?
- 3 + 3 = 6
- 2 + 2 = 4
- 1 + 1 = 2 ✓
What doubling fact is being shown here?
- 4 + 4 = 8
- 3 + 3 = 6 ✓
- 2 + 4 = 6
- 2 + 2 = 4
Which of these part part whole models, would have a missing part of 5?
Match the equation to the correct explanation.
- 1 + 1 = 2
  
  ⇔
  
  Double 1 is 2 ✓
- 4 + 4 = 8
  
  ⇔
  
  Double 4 is 8 ✓
- 3 + 3 = 6
  
  ⇔
  
  3 plus 3 equals 6 ✓
Sam makes a tower that uses double the number of cubes than the one below. How many cubes tall is Sam's tower?
- '6' ✓

Exit quiz

How many cubes are needed on the other side to make this equal?
- 2
- 3
- 4 ✓
- 5
Tick all the correct statements.
- 2 + 2 = 4 ✓
- Double 4 is 2
- Double 2 is 4 so half of 4 is 2 ✓
- half of 2 is 4
What is the missing part in this part-part-whole model?
- 5
- 6
- 4
- 3 ✓
What number would complete this bar model?
- 1 ✓
- 2
- 3
- 4
Match the equation to the inverse.
- 4 + 4 = 8
  
  ⇔
  
  8 - 4 = 4 ✓
- 1 + 1 = 2
  
  ⇔
  
  2 - 1 = 1 ✓
- 5 + 5 = 10
  
  ⇔
  
  10 - 5 = 5 ✓
Sam baked half the number of cakes as Jacob. Jacob baked 4 cakes. How many cakes did Sam bake?
- '8' ✓

Worksheet

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Presentation

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Lesson Details

Key learning points

Halving is the inverse of doubling.
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.