New
New
Lesson 1 of 10
New
New
- Year 3
Composition of 100 in 10s and 1s
I can compose 100 in 10s and 1s.
Lesson details
Key learning points
- There are 10 tens in 100
- There are 100 ones in 100
- 100 can be represented in different ways and in different contexts
Keywords
Equivalent - When two or more things have the same value.
Numeral - A symbol or name that stands for a number.
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.
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 (2025), 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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Prior knowledge starter quiz
6 Questions
Q1.What number is being represented here?
What number is being represented here?
40
60
70
Q2.Finish the sentence. One ten is equal to __________.
Finish the sentence. One ten is equal to __________.
20
1 one
1
Q3.What is four groups of 10?
What is four groups of 10?
4
14
Q4.Match the number of tens to the numeral with the same value.
Match the number of tens to the numeral with the same value.
Q5.What is ten more than 50?
What is ten more than 50?
40
70
Q6.Complete the equation: 6 = 10 −
Complete the equation: 6 = 10 −
Assessment exit quiz
6 Questions
Q1.What numeral represents this base ten block?
What numeral represents this base ten block?
10
1
Q2.What amount is not equivalent to these 10 p pieces?
What amount is not equivalent to these 10 p pieces?
100 p
one pound
Q3.Match the multiples to the equivalent number of tens.
Match the multiples to the equivalent number of tens.
Q4.Complete the equation 100 x = 100.
Complete the equation 100 x = 100.
Q5.How many equal parts has this hundred square been divided into?
How many equal parts has this hundred square been divided into?
20
100
Q6.Which of the equations match the bar model?
Which of the equations match the bar model?
100 x 1 = 100
