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Subtraction help

We have been learning about how subtraction calculations can be solved by counting back and by finding the difference between the numbers. We have been investigating which is the most efficient method for different number sentences. It depends on the numbers but also don't forget to look at whether you can find the answer mentally.


Have a look at the image below - which calculations would you solve mentally, by counting back or by finding the difference. Can you think of any other number sentences you would place in the different columns?


Follow the link below to find a website that will help you to explain your understanding of subtraction by finding the difference on a number line.

Picture 1