Starter quiz
- Match the statements to find half of each number.
- Half of 12 is equal to⇔6 ✓
- Half of 20 is equal to⇔10 ✓
- Half of 14 is equal to⇔7 ✓
- Half of 40 is equal to⇔20 ✓
What number goes in both sentences to make them correct?- '24' ✓
- Which of these problems could I use halving to find the missing factor?
- ___ × 5 = 20
- 2 × ___ = 16 ✓
- ___ × 10 = 40
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- What is the missing factor in this equation? 2 × ______ = 16
- '8' ✓
- Find the missing factor is this equation. ______ × 2 = 26
- '13' ✓
- There are 18 socks in a drawer. How many pairs of socks can be made? ______ pairs
- '9' ✓
Exit quiz
- Match to complete each sentence.
- Double 12 is equal to⇔24 ✓
- Double 30 is equal to⇔60 ✓
- Double 9 is equal to⇔18 ✓
- Double 15 is equal to⇔30 ✓
- There are 13 biscuits in a packet. How many biscuits will be in two packets? ______ biscuits
- '26' ✓
- Match the statements.
- Double 14 is equal to 28⇔Half of 28 is equal to 14 ✓
- Double 7 is equal to 14⇔Half of 14 is equal to 7 ✓
- Double 13 is equal to 26⇔Half of 26 is equal to 13 ✓
- Double 40 is equal to 80⇔Half of 80 is equal to 40 ✓
- Find the missing factor in each equation.
- 2 × ___ = 18⇔9 ✓
- ___ × 2 = 40⇔20 ✓
- 2 × ___ = 22⇔11 ✓
- ___ × 2 = 26⇔13 ✓
- Which of these numbers are examples of a double of a whole number?
- 25
- 18 ✓
- 16 ✓
- 21
- 50 ✓
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- If there are 28 pencils in two packets, how many pencils are in one packet? ______ pencils.
- '14' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- Doubling is a multiplication where one of the factors is 2
- When one of the factors is 2, the other factor is half of the product.
- Doubles facts to 5 can help to double and halve 2-digit numbers.
Common misconception
Children may revert to inefficient strategies to solve problems e.g. counting on, using fingers.
Within the second learning cycle, children are encouraged to evaluate strategies used by others. The most efficient strategies should be discussed together throughout the first learning cycle to support with this.
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.
Check - To evaluate working, ensuring our response provides an answer to the given problem.
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