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