Explain the use of placeholders when multiplying whole numbers by 100
I can use place value to explain placing 2 0's after the final digit when we multiply whole numbers by 100
Explain the use of placeholders when multiplying whole numbers by 100
I can use place value to explain placing 2 0's after the final digit when we multiply whole numbers by 100
Lesson details
Key learning points
- Multiples of 100 have zero in the tens and ones column.
- When a number is multiplied by one hundred the product is a multiple of one hundred.
- Multiplying by one hundred moves all the digits two columns to the left making the digits one hundred times the size.
Common misconception
Many pupils believe that 'adding 2 zeros' is multiplying by 100 which can lead to difficulties later on when they are introduced to decimal numbers.
Don't dismiss it. It's a pattern that has been spotted and generalised. Do encourage the children to work with physical resources that don't involve the numbers themselves so they can understand that it isn't adding zero but changing place value.
Keywords
Placeholder - A placeholder is where we use the digit 0 to hold a place in a number and maintain place value.
Magnitude - The magnitude of a number is its distance from 0
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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