Numbers don’t stop at zero. They continue into negative numbers as you count backwards. If you start at 2 and count backwards, you get 2, 1, 0, -1, -2, and the numbers keep going. Take a look at the ...
A GCSE Maths video about adding and subtracting with negative numbers. The video shows how to use a number line and how to work out the answer by using number discs.
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