New
New
Year 1

# Count efficiently in groups of ten

I can count in groups of ten and identify how many groups there are.

New
New
Year 1

# Count efficiently in groups of ten

I can count in groups of ten and identify how many groups there are.

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## Lesson details

### Key learning points

1. Objects can be put into groups of 10 to make them easier to count.
2. Groups of 10 can be called tens.
3. It is more efficient to skip count in tens than to count in ones
4. Counting back in tens from the total amount can be used to check that the count was accurate.

### Common misconception

Children may confuse the number of groups with the amount altogether, for example, they may count 4 groups of 10 as 4 not 40 They may also confuse the number of groups with the group size.

Draw a ring around each group of 10 whilst using the stem sentence to help describe what you are seeing as you identify each group.

### Keywords

• Groups of 10 - Groups of ten objects that can be counted in tens.

• Tens - Another name for the multiples of ten.

• Decade numbers - These are the multiples of ten which mark the tens boundary where the pattern of counting changes.

• Altogether - The amount in the whole set or group.

• Efficiently - Not wasting time or effort. An efficient strategy is one we can carry out easily.

### 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).

## Starter quiz

### 6 Questions

Q1.
Sam is counting her decade numbers. Which of these numbers won’t she say?
50
30
Q2.
Fill in the missing number. 10, 20 , 30, ___, 50
Q3.
Sam is counting forwards in tens starting from 30 so what is the next number she will say?
Q4.
Jacob is counting backwards in tens from 60 so which of these numbers will he say?
70
14
Q5.
What is the previous decade number?
Q6.
The children are counting backwards in tens. Who is correct?
Correct Answer: An image in a quiz

## Exit quiz

### 6 Questions

Q1.
Sam is counting backwards in tens from the number shown on her Gattegno chart. What is the next number she will say?
Q2.
Fill in the missing number There are ___ groups of 10
Q3.
True or false: There are 4 tens.
False
Q4.
There are ten cherries on each cake. How many cherries are there altogether in the picture? ___
Q5.
Match the number of tens to the number altogether.

100