Lesson 8: Fact Families
Objective
Students will be able to find the sums and differences for related addition and subtraction
facts to 10.
Warm up
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Tell the students that you can make 2 addition problems and 2 subtraction problems using only the
following numbers: 3, 1, and 4. Show them each number sentence and model it using MathLine.
3+1=4
1+3=4
4–1=3
4–3=1
Student Page
Read the Practice section aloud as students read it silently. Encourage them to model the problem using
their MathLines. Have them complete the other activities independently.
Extension
Challenge the students to make 2 addition and 2 subtraction number sentences using the
numbers 6, 2, and 4. Encourage them to model each number sentence using MathLine.
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Answers on page 85
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Name
Lesson 8: Fact Families
Practice
Fact Families share facts.
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2+4=6
4+2=6
6–2=4
6–4=2
What are the numbers shared by this fact family? ____
, _____ , and _____ .
Activities
Add or subtract.
5 + 4 = ______
4 + 5 = ______
9 – 4 = ______
9 – 5 = ______
Write the numbers in the fact family. _______, ________, and ________.
4 + 3 = ______
3 + 4 = ______
7 – 4 = ______
7 – 3 = ______
Write the numbers in the fact family. _______, ________, and ________.
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Name
3 + 6 = ______
6 + 3 = ______
9 – 3 = ______
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9 – 6 = ______
Write the numbers in the fact family. _______, ________, and ________.
Challenge
Finish each fact family.
5 + ____ = 8
1 + ____ = 4
3 + 5 = ____
3 + 1 = ____
8 - ____ = 3
4 – ____ = 1
8 – 3 = ____
4 – 1 = ____
1 + ____ = 9
5 + ____ = 7
8 + 1 = ____
2 + 5 = ____
9 – ____ = 8
7 – ____ = 2
9 – 8 = ____
7 – 2 = ____
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