New
New
Year 3
Use known facts to add and subtract to and from multiples of 100
I can add to and subtract from multiples of 100.
New
New
Year 3
Use known facts to add and subtract to and from multiples of 100
I can add to and subtract from multiples of 100.
Lesson details
Key learning points
- When you add a one-digit number and a multiple of 100, only the 1s digit changes.
- When you subtract a one-digit number from a multiple of 100, the 100s, 10s and 1s digits change.
- When you add a 10s number and a multiple of 100, only the 10s digit changes.
- When you subtract a 10s number from a multiple of 100, the 100s and 10s digits change.
Common misconception
Pupils may need help using number pairs that total 10 to support their thinking in this lesson.
Make explicit connections between number pairs that total ten and the learning (e.g. 10 - 3 = 7 so 100 - 7 = 93 and 100 - 30 = 70).
Keywords
Multiple - A multiple is the result of multiplying a number by another whole number.
Base ten blocks and number lines will help support pupils' thinking and enable them to represent their calculations. Encourage pupils to use number pairs that total 10 and multiples of ten that total 100 to subtract from 100s numbers.
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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Starter quiz
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6 Questions
Q1.
Which numbers are multiples of 100?
550
Q2.
100 + 5 =
Q3.
What is 100 − 3?
87
93
103
Q4.
100 − 30 =
Q5.
Which pairs of numbers could make this calculation correct?
20 and 20
Q6.
What number is missing from the bar model?
Exit quiz
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6 Questions
Q1.
Which calculations equal a multiple of 100?
170 + 70 =
Q2.
What is 400 − 20?
280
320
420
Q3.
Match the equations to the correct answer.
240
250
260
230
Q4.
600 − 8 =
Q5.
Paul is 70cm tall. The boxes are 200 cm high. What is their total height in cm? cm
Q6.
The total height of Paul and the boxes is 400 cm. Paul is 70 cm tall. How high are the boxes in cm? cm
