fact families
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Fact Families. Presentation By: Meagan Warner September 13, 2012. Overview. Today I will teach you how to master fact families I will: T each you the general guidelines for finding a fact family Show you hints and shortcuts for finding fact families - PowerPoint PPT PresentationTRANSCRIPT
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Fact Families
Presentation By: Meagan Warner
September 13, 2012
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Overview Today I will teach you how to master fact
families I will:
Teach you the general guidelines for finding a fact family
Show you hints and shortcuts for finding fact families
Give you several examples so that you can practice
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Basics In fact families, there are 3 numbers
organized in 4 different ways In a family, people are related. In a fact
family, numbers are related.
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How to find a fact family In finding a fact family, there will always be
three numbers involved. For example,
If the 3 numbers you are asked to find a fact family for are 2, 6, and 8, then 2, 6, and 8 will be the only numbers in your fact family.
There will also always be 2 sums and 2 differences.
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Tricks for fact families In a fact family, the biggest number will
always be both of the answers to your sums.
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Example For example,
If 2, 5, and 7 are the numbers in your fact family, then 7 will be both answers to the sums. ___ + ___ = 7 ___ + ___ = 7
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Practice If 3, 6, and 9 are the numbers in your fact
family, where do the 9’s go in your sums? ___ + ___ = 9 ___ + ___ = 9
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Sums in Fact Families To find your first sum, find the two smallest
numbers and add them together. Remember, your biggest number will be what the
sum is set equal to. To find the numbers that go in your second
sum, reverse the numbers you used in your first sum.
For example, in the 3, 6, and 9 fact family 3 + 6 = 9 So… 6 + 3 = 9
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Practice If the numbers in a fact family are 4, 5, and 9,
find the sums. 4 + 5 = 9 5 + 4 = 9
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Tricks for fact families The biggest number will
also always be the first number for your differences.
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Example For example,
If 2, 5, and 7 are the numbers in your fact family, then 7 will be the first digit in your differences. 7 - ___ = ___ 7 - ___ = ___
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Practice If 3, 6, and 9 are the numbers in your fact
family, where do the 9’s go in your differences?
9 - = 9 - =
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Differences In fact family differences, which ever number
that was the answer in the first difference will be the number that you subtract from the big number.
For example, In the 3, 6, and 9 fact family
9 – 6 = 3 So… 9 – 3 = 6
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Completing fact families Find the fact family for 1, 5, and 6. 1 + 5 = 6 5 + 1 = 6 6 – 1 = 5 6 – 5 = 1
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Completing fact families Find the fact family for 2, 5, and 7. 2 + 5 = 7 5 + 2 = 7 7 – 2 = 5 7 – 5 = 2
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Completing fact families Find the fact family for 4, 5, and 9. 4 + 5 = 9 5 + 4 = 9 9 – 4 = 5 9 – 5 = 4
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Conclusion
Now you are a master of fact families. Use what you have learned today when
answering fact family questions. And don’t forget
There will only be 3 numbers in a fact family The biggest number will always be the answer to
both of your sums The biggest number will also always be the first
number in both of your differences
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Resources http://www.bellaonline.com/articles/art57615.
asp http://mathcentral.uregina.ca/QQ/database/Q
Q.09.03/keisha1.html