Chapter+1

=**__Significant Figures__**=


 * Nonzero integers are always sigfigs. Ex. 4.57 has 3 sigfigs
 * Leading zeros that come before all nonzero digits are not sigfigs. Ex. 0.007089 has 4.
 * Captive zeros, however, are. Ex. 0.90008 has 5.
 * Trailing zeros are only sigfigs if the number contains a decimal point. Ex. 100.0 has 4.

__**Adding/Subtracting**__

RULE: Use the least precise place.

5.670 + 4.2 = 9.870 use least precise place: 9.9

21 - 13.8 = ?

least precise place is the units

Thus, 7.2 would round to just 7.

__**Multiplication/Division**__

RULE: Use the least number of significant figures

5.670 x 4.2 = 23.814 rounds to 24 (2 sigfigs)

23 / 275.15 = 0.08359 rounds to 0.084 (2 sigfigs), 8.4 E-2