Homework Help: Math

Posted by Joanne on Thursday, November 6, 2008 at 10:21pm.

Expressed to the correct number of significant figures, the sum of two masses is 445.2 grams. WHich two masses produce this answer?

1) 210.10 g+235.100g
2)210.100 g + 235.10 g
3) 210.1 g + 235.1 g
4) 210.10 g+ 235.10 g

I think the answer is 2 but I don't know the reason why.

Math - Dr Russ, Friday, November 7, 2008 at 3:44am
The answer is 3. Usually the minimum number of decimal places (dp) determines the number of decimal places in the answer. Here both values have one dp so the answer is to one dp.

the results for the others are
1)445.20
2)445.20
4)445.20

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