New
New
Year 3

# Composition of 100 in 10s and 1s

I can compose 100 in 10s and 1s.

New
New
Year 3

# Composition of 100 in 10s and 1s

I can compose 100 in 10s and 1s.

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## Lesson details

### Key learning points

1. There are 10 tens in 100
2. There are 100 ones in 100
3. 100 can be represented in different ways and in different contexts

### Common misconception

Pupils do not identify that ten tens are equal to 100 and cannot decompose 100 in this way.

Base ten blocks or a bead string are useful tools to allow pupils to compose and decompose 100 into equal groups of ten.

### Keywords

• Equivalent - When two or more things have the same value.

• Numeral - A symbol or name that stands for a number.

Base ten blocks and other equipment that clearly show ten groups of ten and 100 groups of one are key for supporting pupils understanding in this lesson.
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).

## Starter quiz

### 6 Questions

Q1.
What number is being represented here?
40
60
70
Q2.
Finish the sentence. One ten is equal to __________.
20
1 one
1
Q3.
What is four groups of 10?
4
14
Q4.
Match the number of tens to the numeral with the same value.

20

50

90

100

Q5.
What is ten more than 50?
40
70
Q6.
Complete the equation: 6 = 10 −

## Exit quiz

### 6 Questions

Q1.
What numeral represents this base ten block?
10
1
Q2.
What amount is not equivalent to these 10 p pieces?
100 p
one pound
Q3.
Match the multiples to the equivalent number of tens.

6 tens

8 tens

10 tens

7 tens

9 tens

Q4.
Complete the equation 100 x = 100.