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Name
6-8
Make a ten to find the total.
1. 7 +
6 = 13
2. 8 +
7 = 15
3. 8 +
9 = 17
Write the time in two different ways.
4.
11 12 1
10
2
3
9
5.
11 12 1
10
2
7
5
6
5 :00
7
8
6
3
9
4
8
5
o’clock
11 12 1
10
2
3
9
4
8
6.
4
8
5
7
o’clock
8 :00
10
6
5
o’clock
10 :00
Add. Use any method.
7.
8. 249 +
751 = 1,000
Make a new ten?
Yes
Make a new ten?
Yes
Make a new hundred?
Yes
Make a new hundred?
Yes
Make a new thousand?
No
Make a new thousand?
Yes
9. Stretch Your Thinking Explain how to solve for
an unknown addend.
Use the Adding Up method. Add to the next ten and hundred, then add to
the known sum. The amount that was added up is the unknown addend.
172
UNIT 6 LESSON 8
Word Problems: Unknown Addends
© Houghton Mifflin Harcourt Publishing Company
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