Starter quiz
2 x 5 = 10, so 2 x 10 = ___- 15
- 20 ✓
- 60
- 80
-
8 x 10 = 80, so 8 x 5 = ___- 20
- 25
- 40 ✓
- 35
-
- 6 x 10 = 60, so 3 x 10 = ______
- '30' ✓
- 3 x 10 = 30, so 3 x 5 = ______
- '15' ✓
- Jacob throws 6 bean bags into the ‘5 points’ bucket and scores 30 points. Sofia throws all 6 of her bean bags into the ‘10 points’ bucket. How many points did she earn in total?
- 10
- 20
- 50
- 60 ✓
-
- Jacob throws 4 bean bags into the ‘10 points’ bucket and scores 40 points. Sofia throws all 4 of her bean bags into the ‘5 points’ bucket. How many points did she earn in total?
- 10
- 30
- 50
- 20 ✓
-
Exit quiz
- 5 x 5 = 25, so 5 x 10 = ______
- 20
- 30
- 40
- 50 ✓
-
- 7 x 10 = 70, so 7 x 5 = ______
- 25
- 35 ✓
- 45
- 55
-
Who has more money, Sofia or Jacob?- Sofia ✓
- Jacob
-
How much money does Jacob have?- 40 p
- 80 p
- 20 p ✓
- 4 p
-
How many fives will be equal to 3 tens?- 2
- 5
- 4
- 6 ✓
-
Laura has 4 ten-pence coins. Jun has some five-pence coins. They both have the same amount of money. How many five-pence coins does Jun have? ______- '8' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- When we multiply the same factor by 5 and 10, the product of the factor × 10 is double the product of the factor x 5
- When we multiply the same factor by 5 and 10, the product of the factor × 5 is half of the product of the factor × 10
- When the products are the same, the factor × 5 is double the factor × 10
- When the products are the same, the factor × 5 is half of the factor × 10
Common misconception
Children may incorrectly double or halve to find the missing products or factors.
The use of counters or visuals will help children to see the relationship between 10 and 5 in each context and support them to know when they must use doubling and when they must use halving.
Keywords
Factor - A factor is a number which exactly divides another whole number.
Product - A product is the result of two or more numbers multiplied together.
Double - To become twice as many / to multiply by two.
Half - One of two equal parts of a whole. / To divide into two equal parts.
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