This fun number search involves students finding sets of numbers that sum to 1 and is perfect for students getting used to adding that crosses zero, the commutativity of addition and addition involving negative and positive numbers.

Numbers can be combined horizontally, vertically and diagonally and may contain up to four digits. Our answers show numbers being used more than once but teachers and parents can decide on this rule. Why not add a competitive edge, who will find the most? Who will be the first to find 30 sets of numbers that sum to 1?