New
New
Year 3

# Composition of 100 in 50s, 25s and 20s

I can compose 100 in 50s, 25s and 20s.

New
New
Year 3

# Composition of 100 in 50s, 25s and 20s

I can compose 100 in 50s, 25s and 20s.

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## Lesson details

### Key learning points

1. 100 can be divided into equal parts
2. There are two 50s in 100
3. There are four 25s in 100
4. There are five 20s in 100

### Common misconception

Pupils may believe only multiples of 10 can compose 100 and therefore do not see four groups of 25.

Focus on practical representations e.g. bead strings and base 10 blocks where 100 can be composed and decomposed.

### Keywords

• Compose - You can compose larger numbers from smaller numbers.

• Decompose - You can decompose whole numbers into smaller numbers.

Multiplication equations are used to represent compositions of 100. Take time to connect these to arrays, repeated addition and ways of saying multiplication including groups of.
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 numeral represents one hundred?
1
10
Q2.
Which expression is equivalent to 10?
1 × 100
10 × 10
Q3.
Match the equivalent amounts.

80

30

100

70

50

Q4.
100 = x 1
Correct Answer: 100, one hundred, hundred, a hundred
Q5.
Which equation is equal to 100?
10 + 10
10 x 1
Q6.
If 100 decomposed into ten equal parts there will be in each part.
100
1

## Exit quiz

### 6 Questions

Q1.
How many tens is 100 composed of?
Correct Answer: 10, ten, ten tens, 10 tens
Q2.
100 can be decomposed into how many tens?
100
1
Q3.
Complete the equation: 50 × = 100
Correct Answer: 2, two, x 2, 50 x 2, 2 x 50
Q4.
100 can be composed of 4 equal parts. How many ones are in each part?
4
20