New
New
Year 3

# Use known facts to solve problems involving partitioning numbers

I can use known facts to help me solve partitioning problems.

New
New
Year 3

# Use known facts to solve problems involving partitioning numbers

I can use known facts to help me solve partitioning problems.

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## Lesson details

### Key learning points

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

### Common misconception

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

### Keywords

• Double - Double means to become twice as many.

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

Pupils will find base ten blocks useful for this session. Encourage them to manipulate the blocks, partitioning 100 into 10 tens and redistributing by combining 10s to make 100
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).

## Starter quiz

### 6 Questions

Q1.
Match the numbers so that they are a pair that totals 10.

1

4

2

3

Q2.
What is double 6?
Correct Answer: 12, twelve
Q3.
What is ten more than 40?
Correct Answer: 50, fifty
Q4.
120 + ___ = 150
10
20
40
Q5.
What is value of the part missing from the bar model?
20
30
40
Q6.
What is value of the part missing from the bar model?
Correct Answer: 120, one hundred and twenty

## Exit quiz

### 6 Questions

Q1.
Match the multiples of ten to their doubles.

60

80

100

120

Q2.
What is double 80?
116
140
180
Q3.
Complete the calculation: 60 + = 100
Correct Answer: 40, forty
Q4.
What number is missing from the bar model?
Correct Answer: 50, fifty
Q5.
What number is missing from the bar model?
80
90
110
Q6.
Which pair of numbers could not be used to complete the bar model?
100 and 30
80 and 50
70 and 60
Correct answer: 90 and 20