Fact Families
Numbers that belong together
Three numbers make a family of four facts — two adding, two taking away!
3
5
8
3 + 5 = 8
5 + 3 = 8
8 − 3 = 5
8 − 5 = 3
The numbers 3, 5 and 8 make a fact family: two adds and two take-aways. Learn one fact and you know all four! Adding and subtracting are opposites — they undo each other.