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).

Video

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6 Questions

Q1.
What number is being represented here?
An image in a quiz
40
Correct answer: 50
60
70
Q2.
Finish the sentence. One ten is equal to __________.
20
Correct answer: 10 ones
1 one
1
Q3.
What is four groups of 10?
4
14
Correct answer: 40
Q4.
Match the number of tens to the numeral with the same value.
Correct Answer:2 tens,20

20

Correct Answer:5 tens,50

50

Correct Answer:9 tens,90

90

Correct Answer:10 tens,100

100

Q5.
What is ten more than 50?
An image in a quiz
40
Correct answer: 60
70
Q6.
Complete the equation: 6 = 10 −
Correct Answer: 4, four, for

6 Questions

Q1.
What numeral represents this base ten block?
An image in a quiz
Correct answer: 100
10
1
Q2.
What amount is not equivalent to these 10 p pieces?
An image in a quiz
Correct answer: 10 p
100 p
one pound
Q3.
Match the multiples to the equivalent number of tens.
Correct Answer:60,6 tens

6 tens

Correct Answer:80,8 tens

8 tens

Correct Answer:100,10 tens

10 tens

Correct Answer:70,7 tens

7 tens

Correct Answer:90,9 tens

9 tens

Q4.
Complete the equation 100 x = 100.
Correct Answer: 1, one, 1
Q5.
How many equal parts has this hundred square been divided into?
An image in a quiz
Correct answer: 10
20
100
Q6.
Which of the equations match the bar model?
An image in a quiz
Correct answer: 100 = 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10
Correct answer: 100 = 10 x 10
100 x 1 = 100