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OpenStudy (anonymous):
estimate product 49 * 3.1
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OpenStudy (kainui):
49 is almost 50 and 3.1 is almost 3 so you can estimate that it's 50 x 3. That's pretty easy to multiply, that's just 150!
OpenStudy (unklerhaukus):
\[49 \times 3.1 \approx 50 \times 3 =150\]
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