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Year 2

Explain how groups of five and ten are related

I can explain how groups of five and ten are related.

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New
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Year 2

Explain how groups of five and ten are related

I can explain how groups of five and ten are related.

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Share activities with pupils
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Lesson details

Key learning points

  1. Five is half of ten
  2. __ groups of 5 will be half __ groups of 10
  3. Ten is double 5
  4. __ groups of 10 will be double __ groups of 5

Keywords

  • Related - The relationship between a set of values.

  • 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.

Common misconception

Pupils may assume that multiples of 5 and 10 are multiples of 10

Show children the relationship between 5s and 10s using the multiplication chart and number line. Make clear that even multiples of 5 are multiples of 10 Not all multiples of 10 are multiples of 5 Encourage discussions to highlight the relationship.

Continue to chorally rehearse 5s and 10s within and outside of this lesson. The more children can recall the more confident they will feel.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Lesson video

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Starter quiz

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6 Questions

Q1.
Look at the number sequence: ___, 30, 35 To find the previous multiple of 5 you must ________ 5
add
Correct answer: subtract
multiply
Q2.
Look at the number sequence: 50, 55, ___ To find the next multiple of 5 you must ________ 5
Correct answer: add
subtract
multiply
Q3.
The next multiple of 10 from 40 is: 40,
Correct Answer: 50, fifty
Q4.
Pencils come in packs of 5 What is the missing multiple from the table? The missing multiple is
An image in a quiz
Correct Answer: 60
Q5.
Look at the representation below. Select the correct equation which shows this.
An image in a quiz
3 × 10 = 3 × 10 − 10
3 × 10 = 3 × 10 + 10
4 × 10 = 4 × 10 + 10
Correct answer: 4 × 10 = 3 × 10 + 10
Q6.
Look at the representation below. Select the correct equation which shows this.
An image in a quiz
4 × 10 = 3 × 10 − 10
4 × 10 = 4 × 10 + 10
Correct answer: 4 × 10 = 5 × 10 − 10
4 × 10 = 5 × 10 + 10

Exit quiz

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6 Questions

Q1.
Select the correct missing word or phrase. 5 is __________ 10
An image in a quiz
Correct answer: half of
double
greater than
Q2.
10 is __________ 5
An image in a quiz
half of
Correct answer: double
less than
Q3.
Which numbers are multiples of both 5 and 10?
15
Correct answer: 20
25
Correct answer: 30
Q4.
Is the number 30 a multiple of 5, 10 or both?
Only a multiple of 5
Only a multiple of 10
Correct answer: Multiple of both 5 and 10
Q5.
If I count from 30 to 59, there are 6 multiples of 5 that I would say. This means that there are ___ multiples of 10 that I would say.
6
12
Correct answer: 3
Q6.
If I count from 60 to 99, there are 4 multiples of 10 that I would say. This means that there are ___ multiples of 5 that I would say.
4
5
Correct answer: 8