Starter quiz
Which double is being shown here?- Double 6 ✓
- Double 4
- Double 5
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Double 3 tens is ___- 6
- 16
- 60 ✓
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- Double 12 is ______
- '24' ✓
- Double 40 is ______
- '80' ✓
- Which of these equations could I use doubling knowledge to solve?
- 2 × 6 = ? ✓
- 4 × 2 = ? ✓
- 4 + 2 = ?
-
- What is 14 × 2 = ______?
- '28' ✓
Exit quiz
Use the bar model to complete the sentence. Half of 8 is equal to ______- '4' ✓
- If I know that half of 6 is equal to 3, then I know that _____________
- double 4 is equal to 8
- double 3 is equal to 6 ✓
- double 2 is equal to 4
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Which facts are represented by this bar model?- Double 4 is equal to 8
- Double 2 is equal to 4 ✓
- Half of 6 is equal to 3
- Half of 4 is equal to 2 ✓
-
Which equation is represented by this bar model?- 2 × 3 = 6
- 2 × 5 = 10 ✓
- 2 × 4 = 8
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- Alex had 4 marbles. He gave half to Jacob. How many marbles did Jacob get? ______ marbles
- '2' ✓
- Aisha gave half of her biscuits to Alex. Aisha was left with 6 biscuits. How many biscuits did Aisha have to begin with? ______ biscuits
- '12' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- If double 4 is 8, then half of 8 is 4
- Halving means to partition the number into two equal groups.
- Halving is the inverse of doubling.
- Whether doubling or halving, we can also see these as our 2 times tables facts.
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.
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.
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