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```Name
1-7
1.
4
+
_5
9
8
+
_3
11
7
+
_8
15
9
+
_0
9
6
+
_9
15
8
+
_5
13
11
_5
6
18
_9
9
10
_5
5
7
_5
2
15
_6
9
Subtract.
2.
14
_6
8
3. Complete the Math Mountains and equations.
14
14
6
6
8
6 + 8 = 14
6+ 8
14
6
8
=
14
8
14 - 6 = 8
4. 6 +
6
=
12
15 - 7 = 8
7+ 9
=
16
5. Stretch Your Thinking You have a stack of pennies.
Without counting the pennies, how can you know if
there is an odd or even number of them?
Sample answer: I can put the pennies in 2 rows and match them.
If there is 1 penny left over, there is an odd number of pennies.
If all the pennies have a match, there is an even number of pennies.
14
UNIT 1 LESSON 7
Strategies Using Doubles
Â© Houghton Mifflin Harcourt Publishing Company
Write the unknown addend (partner).
```
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