Use known facts to add and subtract to and from multiples of 100 | Maths

Starter quiz

Which numbers are multiples of 100?
- 100 ✓
- 400 ✓
- 550
- 1,000 ✓
100 + 5 = ______
- '105' ✓
What is 100 − 3?
- 87
- 93
- 97 ✓
- 103
100 − 30 = ______
- '70' ✓
Which pairs of numbers could make this calculation correct?
- 10 and 40 ✓
- 20 and 20
- 20 and 30 ✓
What number is missing from the bar model?
- '90' ✓

Which calculations equal a multiple of 100?
- 50 + 50 = ✓
- 140 + 60 = ✓
- 170 + 70 =
- 280 + 20 = ✓
What is 400 − 20?
- 280
- 320
- 380 ✓
- 420
Match the equations to the correct answer.
- 200 + 40 =
  
  ⇔
  
  240 ✓
- 300 − 50 =
  
  ⇔
  
  250 ✓
- 200 + 60 =
  
  ⇔
  
  260 ✓
- 300 − 70 =
  
  ⇔
  
  230 ✓
600 − 8 = ______
- '592' ✓
Paul is 70cm tall. The boxes are 200 cm high. What is their total height in cm? ______ cm
- '270' ✓
The total height of Paul and the boxes is 400 cm. Paul is 70 cm tall. How high are the boxes in cm? ______ cm
- '330' ✓

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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.

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).

Multiple - A multiple is the result of multiplying a number by another whole number.