Guess my number

This resource consists of a series of clues that require the children to apply their knowledge and understanding of known terms such as square numbers, prime numbers, factors, multiples, odd/even, triangular numbers and digit sum, to guess the number being described. I have used it as a mental warm up at the beginning of a maths lesson with the children (after each clue) recording their numbers on white boards. As a new clue is added, the children adjust their responses by deleting numbers that do not fulfill all of the clues. It is great for reinforcing but also assessing understanding.