Age 7 to 11
Remember the relationship between 'one times' and 'ten times' a number. For example, 5 x 1 = 5 and 5 x 10 = 50.
You could begin by making both sides of the equation equal to 10, then 20, then 30 and so on.
Is there more than one way of completing the equation for each total? Can any of them be made in lots of different ways?