Understanding fact families (especially those which create number sentences that add up to 10) are a key concept infirst-grade math.
Afact familyis made up of three numbers. As in any family, the members (number) are related. At least four math facts that can be made with them.
For example, consider 6, 4, and 10. These members of a fact family are related because the first two numbers can be added to get the third.
Knowing the Tens Facts
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Begin by having your child list out the Tens Facts. You and your child can figure out the combination of numbers that add up to 10.
Starting with1, ask your child what they need to add to make 10.
Be sure to list the inverse facts as well—for example:
1 + 9 = 10
and
9 + 1 = 10
Draw a Fact Family House
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You can also draw a fact family house orprint oneout. All your house needs to have is a roof with three windows and a body with four bay windows.
Write two blank addition problems (____ + ____ = _____) and two blank subtraction problems (____ - ____ = _____) in the bay windows.
Move in the Fact Family
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In the attic windows of your fact family house, ask your child to write the three numbers that make up the family's members. Put the largest number in the top window.
If you begin your Tens Facts with1 + 9, the numbers in the windows will be10,9,and1.
From there, have your child complete the two addition problems using the list they created. Once they've figured those out, the subtraction problems should be easy.
If you need to prompt your child, trying asking, "If I added 9 to 1 to get 10, what do you think would be left if I took that 9 away again?"
Meet the Fact Family Neighbors
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Once you've mastered the fact family home, it's time to move on to creating a neighborhood. To start, simply draw or print four more houses. If you want to make the activity more of a craft, you can print the houses on heavy paper.
Next, have your child fill in the rest of the Tens Facts (one in each house) to create the entire neighborhood.
Build a Fact Family Neighborhood
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Once your neighborhood is finished, have your child decorate the homes. Leave some extra paper at the bottom of the house so your child can cut them out. You can even fold the extra tab under to make the houses stand up.
Building fact family neighborhoods are great way tomake first grade math concepts easy and funfor your kids to learn.