A fact family in mathematics is a set of related addition and subtraction sentences (or multiplication and division sentences) that use the same three numbers. Here's one way to look at it: the numbers 4, 7, and 11 form a fact family because they can generate two addition facts—4 + 7 = 11 and 7 + 4 = 11—and two subtraction facts—11 – 7 = 4 and 11 – 4 = 7. This simple grouping reveals a deeper structural relationship between operations, helping learners see how addition and subtraction, or multiplication and division, are inversely connected.
Quick note before moving on.
