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Fact Families

8 - 3 = 5. 3 + 5 = 8. 5 + 3 = 8. Fact Families. 5 + 3 = 8. 8 - 5 = 3 . 3 + 5 = 8. 5 + 3 = 8. 8 - 5 = 3 . 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.

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Fact Families

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  1. 8 - 3 = 5 3 + 5 = 8 5 + 3 = 8 Fact Families 5 + 3 = 8 8 - 5 = 3 3 + 5 = 8 5 + 3 = 8 8 - 5 = 3 8 - 3 = 5 8 - 3 = 5 8 - 5 = 3 3 + 5 = 8

  2. 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.

  3. Think About Fact Families as a real family • Daddy – Biggest Number • Mommy – Middle Number • Baby – Smallest Number

  4. Lets look at some examples! • 2, 9, 11 • 6, 2, 8 • 5, 7, 2

  5. How do you relate the numbers? • With each family you can produce 4 math sentences. • 2 addition • ____ + ____ = ____ • ____ + ____ = ____ • 2 subtraction • ____ - ____ = ____ • ____ - ____ = ____

  6. 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.

  7. Example : 5, 3, 8 • Can anyone make me 2 subtraction sentences with these numbers? • 8- 5 = 3 • 8 - 3 = 5

  8. 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

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