Checking and securing understanding of written addition and subtraction strategies
I can generalise and fluently use written addition and subtraction strategies, including columnar formats, with decimals.
Checking and securing understanding of written addition and subtraction strategies
I can generalise and fluently use written addition and subtraction strategies, including columnar formats, with decimals.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Addition and subtraction strategies can make calculations easier.
- The decimal point can help ensure that digits with the same place value are combined.
- The decimal point will not help if the values are not measured in the same units.
Keywords
Metric - Metric units are based around the standard units of metre, gram and litre.
Additive inverse - The additive inverse of a number is a number that, when added to the original number, gives the sum of 0.
Absolute value - The absolute value of a number is its distance from zero. E.g. 5 and (-5) are both 5 away from zero and so both have an absolute value of 5.
Common misconception
When subtracting you always write the bigger number above the smaller number.
The context of spending money should help with this, as they will end up with a positive balance which is not possible .
Equipment
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
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Starter quiz
6 Questions
8 + (-5)
5 + (-8)
8 + 5
(-5) + (-8)
3
(-3)
13
(-13)
Exit quiz
6 Questions
