For example, 4 8 12, 8 4 12, 12 4 8, and 12 8 4 is an addition/subtraction fact family, and 4 º 8 32, 8 º 4 32, 32/4 8, and 32/8 4 is a multiplication/ division fact family. the numbers of a fact family that students can use to practice addition/subtraction or multiplication/ division facts.