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Name
1-4
8 + 6 = 14 or 14 – 8 = 6
Already
8
or
8
or
8
9 10 + 4 more
6
+ 2 + 4 =14
Already 8
2 more to
10
4 more to
14
10 + 4
© Houghton Mifflin Harcourt Publishing Company
Find the unknown addend (unknown partner).
1. 5 +
7
=
12
15 - 8 = 7
8+ 8
=
16
2. 7 +
9
=
16
13 - 4 = 9
9+ 3
=
12
3. 3 +
9
=
12
11 - 2 = 9
7+ 6
=
13
4. 9 +
6
=
15
14 - 8 = 6
17 - 9 = 8
5. 8 +
4
=
12
16 - 8 = 8
16 - 7 = 9
6. 5 +
8
=
13
18 - 9 = 9
12 - 7 = 5
7. 4 +
8
=
12
11 - 4 = 7
12 - 9 = 3
8. Explain Your Thinking Choose one equation above.
Explain how you can make a ten to find the partner.
Answers will vary.
UNIT 1 LESSON 4
Relate Unknown Addends and Subtraction
7