Use known facts to solve problems involving partitioning numbers | Maths

Starter quiz

Match the numbers so that they are a pair that totals 10.
- 9
  
  ⇔
  
  1 ✓
- 6
  
  ⇔
  
  4 ✓
- 8
  
  ⇔
  
  2 ✓
- 7
  
  ⇔
  
  3 ✓
What is double 6?
- '12' ✓
What is ten more than 40?
- '50' ✓
120 + ___ = 150
- 10
- 20
- 30 ✓
- 40
What is value of the part missing from the bar model?
- 20
- 30
- 40
- 50 ✓
What is value of the part missing from the bar model?
- '120' ✓

Match the multiples of ten to their doubles.
- Double 30
  
  ⇔
  
  60 ✓
- Double 40
  
  ⇔
  
  80 ✓
- Double 50
  
  ⇔
  
  100 ✓
- Double 60
  
  ⇔
  
  120 ✓
What is double 80?
- 116
- 140
- 160 ✓
- 180
Complete the calculation: 60 + ______ = 100
- '40' ✓
What number is missing from the bar model?
- '50' ✓
What number is missing from the bar model?
- 80
- 90
- 110
- 120 ✓
Which pair of numbers could not be used to complete the bar model?
- 100 and 30
- 80 and 50
- 70 and 60
- 90 and 20 ✓

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Multiples of ten that total one hundred can help with adding and subtracting 3-digit numbers.
Doubles and near doubles can be helpful when adding multiples of ten together.
Partitioning 100 into 10 tens and combining tens to make 100 can help with calculating.

Pupils may struggle when adding near double multiples of ten and when crossing 100s boundaries.

Encourage pupils to use their known facts to support thinking and combine this with the use of base ten blocks, especially for crossing 100

Double - Double means to become twice as many.
Multiple - A multiple is the result of multiplying a number by another whole number.