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1) Count the number of significant figures in the decimal portion of each number in the problem. (The<br />
digits to the left of the decimal place are not used to determine the number of decimal places in the<br />
final answer.)<br />
2) Add or subtract in the normal fashion.<br />
3) Round the answer to the LEAST number of places in the decimal portion of any number in the<br />
problem<br />
The following rule applies for multiplication and division:<br />
The LEAST number of significant figures in any number of the problem determines the number of<br />
significant figures in the answer.<br />
This means you MUST know how to recognize significant figures in order to use this rule.<br />
How Many Significant Digits for Each Number?<br />
1) 2359 = 4<br />
2) 2.445 x 10−⁵= 4<br />
3) 2.93 x 10 = ___3___<br />
4) 1.30 x 10−⁷= ___3___<br />
5) 2604 = 4<br />
6) 9160 = _3_____<br />
7) 0.0800 = _3_____<br />
8) 0.84 = ____2__<br />
9) 0.0080 = ___2___<br />
10) 0.00040 = ___2___<br />
11) 0.0520 = _____3_<br />
12) 0.060 = ______ 2<br />
13) 6.90 x 10 ¹= ____3__<br />
14) 7.200 x 10 = ___4___<br />
15) 5.566 x 10 ²= ___4___
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