Posted by **A** on Wednesday, September 16, 2009 at 5:41pm.

Add thirty-eight and nine tenths, five and fifty-eight hundredths, seven, and fifteen

and eight tenths.

A~1662?

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**Ms. Sue**, Wednesday, September 16, 2009 at 5:50pm
That doesn't look right.

38.9 + 5.58 + 7.0 + 15.8

Guestimating -- the answer should be in the 60s.

What answer do you get?

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**Simon**, Wednesday, September 16, 2009 at 5:50pm
38.9 + 5.58 + 7 + 15.8

Significant digits will round to the whole number due to the 7.

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**just a girl**, Wednesday, September 16, 2009 at 5:51pm
67.28

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**A**, Wednesday, September 16, 2009 at 5:51pm
67.28?

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**Ms. Sue**, Wednesday, September 16, 2009 at 6:03pm
Right. 67.28 is correct.

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**drwls**, Wednesday, September 16, 2009 at 6:03pm
Yes, 67.28. I would not do any rounding off (to 67) unless told to.

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