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.
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?'
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).
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