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OpenStudy (anonymous):
Estimate 80.8/8.9 using compatible numbers A. about 8 B. about 10 C. about 9 D. about 11
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OpenStudy (anonymous):
C. 80.8 is ~ 81, and 8.9 is ~ 9. 9*9 = 81
OpenStudy (anonymous):
Which can be rewritten as 81 / 9 = 9
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