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Today's first lesson focuses on inverse operations. This is where we use the opposite of the operation to check our answers. For examples, using subtraction to check our addition calculations like this:

                                  120 + 16 = 136                     136 - 16 = 120



We can also do this for multiplication and division, like this:


                                  6 x 7 = 42                      42 ÷ 6 = 7

Inverse operations

Still image for this video


easier activity, if you find the other activity tricky


Once you have finished the first lesson, check your understanding of addition and subtraction by trying the checkpoint and white rose assessment below.