Use knowledge of the 5 and 10 times tables to solve problems | Maths

Starter quiz

Double 20 is ___

35

40 ✓

45
Double 25 is ___

40

45

50 ✓

55
Half of 50 is ___

5

15

20

25 ✓
Fill in the missing number: 4 x 5 = 20 ___ x 10 = 20

2 ✓

3

4

6
How many fives will be equal to 4 tens?

5

6

7

8 ✓
How many fives will be equal to 5 tens?

10 ✓

8

6

4

Exit quiz

Match each of the problems to their answers.

How many fives are equal to 6 tens?

⇔

12 fives ✓

How many tens are equal to 6 fives?

⇔

3 tens ✓

How many tens are equal to 8 fives?

⇔

4 tens ✓
Find the missing product.

15

30

45

60 ✓
It costs £5 for children and £10 for adults to ride the Ferris Wheel. Today, only adults went on the ride. The ride made £70 How many adults rode the Ferris Wheel? ______ adults

'7' ✓
It costs £5 for children and £10 for adults to ride the Ferris Wheel. Yesterday, only children rode the Ferris Wheel. The ride made £60 How many children rode the Ferris Wheel? ______ children.

'12' ✓
Jacob had 4 balls and threw them all in the ‘5 points’ basket. What was his score? ______

'20' ✓
Sofia got 2 balls in the ‘5 points’ basket’ and 2 balls in the ‘10 points’ basket. What was her score?

40

20

30 ✓

50

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

10 is double 5, so when the products are the same, the factor × 10 is half of the factor × 5
When we multiply the same factor by 5 and 10, the product of the factor × 10 is double the product of the factor × 5
5 is half of 10, so when the products are the same, the factor × 5 is double the factor × 10
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

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

Product - A product is the result of two or more numbers multiplied together.
Factor - A factor is a number which exactly divides another whole number.
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.