nudging towards the fundamental theorem of arithmetic (and maybe to provide a reason why 1 is not considered to be a prime number any longer) this can be done with or without this sheet [e.g. pose the task of finding all the ways that 90 can be broken down] what are the missing products? factor trees drawn by students in Y5 at the International School of Toulouse see pinkmathematics what are the missing numbers? find a way to break down 720 into a product of prime factors that fits this tree:
