Can you place the numbers from 1 to 10 in the grid?
If you can post the triangle with either the blue or yellow colour face up, how many ways can it be posted altogether?
Find out how we can describe the "symmetries" of this triangle and investigate some combinations of rotating and flipping it.
Four children were sharing a set of twenty-four butterfly cards. Are there any cards they all want? Are there any that none of them want?
There are ten children in Becky's group. Can you find a set of numbers for each of them? Are there any other sets?