Explain how to use the factor pairs of 100 to solve calculations efficiently
I can explain how to use the factor pairs of 100 to solve calculations efficiently.
Explain how to use the factor pairs of 100 to solve calculations efficiently
I can explain how to use the factor pairs of 100 to solve calculations efficiently.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Scales are often marked in factors of 100
- Rearranging calculations to make use of factors of 100 can simplify them
Keywords
Factor - Factors are whole numbers which exactly divide another whole number.
Commutative - The commutative law states that you can write the values of a calculation in a different order without changing the calculation; the result is the same. It applies for addition and multiplication.
Associative - The associative law states that it doesn't matter how you group or pair values (i.e. which we calculate first), the result is still the same. It applies for addition and multiplication.
Common misconception
Pupils decompose the wrong factor therefore find it difficult to find a pair of factors that are equal to 100
Scaffold pupil's thinking when they begin to tackle a 2 digit by 2 digit calculation. Encourage them to ask questions of the numbers, for example: 'Is one of the numbers I have to start with a factor of 100?'
To help you plan your year 5 maths lesson on: Explain how to use the factor pairs of 100 to solve calculations efficiently, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 5 maths lesson on: Explain how to use the factor pairs of 100 to solve calculations efficiently, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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Explore more key stage 2 maths lessons from the Use common factors and multiples to solve calculations efficiently unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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Starter quiz
6 Questions
Exit quiz
6 Questions
2 and 50
4 and 25
5 and 20