Use knowledge of column addition and subtraction to calculate with decimal numbers
I can use knowledge of column addition and subtraction to calculate with decimal numbers.
Use knowledge of column addition and subtraction to calculate with decimal numbers
I can use knowledge of column addition and subtraction to calculate with decimal numbers.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Numbers are recorded in columns with the same value digits in each column.
- Start with the smallest value column in case numbers need to be regrouped or exchanged.
- If the value of a digit in the minuend is greater than the same digit in the subtrahend, you will need to exchange.
- Make sure that any regrouped numbers are added in with others of the same value.
Keywords
Decimal number - A decimal number has a decimal point followed by digits that show the fractional part.
Regrouping - The process of unitising and exchanging between place values is known as regrouping. For example: ten ones can be regrouped for one ten.
Place value - The value of a digit in a number based on where it is placed.
Common misconception
Pupils regroup incorrectly, particularly when subtracting e.g. exchanging one ten for ten ones.
Build the calculation using place value counters on a grid set out like a column method. Ask pupils to represent regrouping with counters.
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).
Lesson video
Loading...
Starter quiz
6 Questions
Exit quiz
6 Questions
