Count efficiently in groups of two, five and ten | Maths

Starter quiz

Which of the pictures below shows equal groups?
Sam is skip counting in twos. Order these numbers in the order she would count them when counting forwards.

1

⇔

10

2

⇔

12

3

⇔

14

4

⇔

16
Sam is skip counting in fives. Order these numbers in the order she would count them when counting forwards.

1

⇔

15

2

⇔

20

3

⇔

25

4

⇔

30
Complete the stem sentence. There are ___ groups of 5

'3' ✓
Which of the following describes the groups shown in the picture?

There are 6 tens. There are 60 altogether. ✓

There are 6 tens. There are 30 altogether.

There are 3 tens. There are 60 altogether.
The pictures below show objects that are arranged in groups of 5 Which could also be counted in tens?

Exit quiz

Complete the stem sentences about the picture.

The chocolates are in groups of 2, so I can count them in twos.

The chocolates are in groups of 5, so I can count them in fives. ✓

The chocolates are in groups of 10, so I can count them in tens. ✓
True or false. You could skip count to find how many altogether in this picture.

True
False ✓
Which pictures would you count in fives?
Jacob is counting in fives. Which of the following numbers would he say?

20 ✓

18

35 ✓
Sam and Jacob each have 4 boxes of toy cars. Jacob has 2 in each box. Sam has 5 in each box. Who will have more altogether?

Sam ✓

Jacob
Sam has 20 counters. She wants to put them into groups to count them efficiently. How many should she put into each group to count them in the most efficient way?

2

5

10 ✓

Worksheet

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Lesson Details

Key learning points

The amount in a group can tell you whether to skip count in twos, fives or tens.
The pattern of the ones digits can help you recognise groups of two, five or ten.
It is more efficient to count in groups of a larger size.
When there are an equal number of groups, the larger the size of each group, the greater the amount altogether.

Common misconception

Children may not be sure which unit to count in. They may confuse the size of the group with the number of groups, for example saying 5 groups of 2 instead of 2 groups of 5.

Encourage children to draw a ring around each group as they count the groups and display and use the stem sentence to help them describe this.

Keywords

Tens - Another name for the multiples of ten.
Twos - Another name for the multiples of two or even numbers.
Fives - Another name for the multiples of five
Skip count - Counting forwards or backwards in a number other than one.
Efficiently - Not wasting time or effort. An efficient strategy is one we can carry out easily.