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Mathematics 10 Online
OpenStudy (anonymous):

estimate product 49 * 3.1

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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