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8-3=5 3+5=8 5+3=8 5+3=8 8-5=3 3+5=8 8-5=3 5+3=8 8-3=5 8-3=5 8-5=3 3+5=8 What is a Fact Family? A Fact Family is a set of related facts. In math this means 3 numbers that are related in some way. No other numbers can be included in the family. Think About Fact Families as a real family Daddy – Biggest Number Mommy – Middle Number Baby – Smallest Number Lets look at some examples! 2, 9, 11 6, 2, 8 5, 7, 2 How do you relate the numbers? With each family you can produce 4 math sentences. 2 addition ____ + ____ = ____ ____ + ____ = ____ 2 subtraction ____ - ____ = ____ ____ - ____ = ____ Example : 5, 3, 8 Can anyone make me 2 addition sentences with these numbers? 3+5=8 5+3=8 We used the same two numbers as the addends, we just used what is called turning around the facts. Example : 5, 3, 8 Can anyone make me 2 subtraction sentences with these numbers? 8-5=3 8-3=5 Now put it all together and you have your fact family. 5, 3, 8 3+5=8 5+3=8 8–5=3 8–3=5