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If you click on 'Pause' in the interactivity, you can see some examples of other children's thinking, which might help you form your mathematical arguments.
You may wish to use some hands-on resources and/or sketch some pictures to help you.
Can you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?
Can you select the missing digit(s) to find the largest multiple?
Three dice are placed in a row. Find a way to turn each one so that the three numbers on top of the dice total the same as the three numbers on the front of the dice. Can you find all the ways to do this?