Sig Figs - UCSB
Sig Figs
1. Rules for determining significant figures
a. Nonzero integers always count as sig figs
b. Zero’s can be one of three types:
i. leading zeros do not count (ex. 0.0012 2 sig figs)
ii. captive zeros do count (ex. 1.0012 5 sig figs)
iii. trailing zeros do count if the number has a decimal point
(ex. 1.00120 6 sig figs, 120 2 sig figs)
Determine the number of sig figs in:
5.010 0.602 1.20 x 10-5 1000.34 35007.3040 650 420.
2. Rules for calculating with significant figures
a. In multiplication/division, the answer contains the same number of sig figs as the least precise number (least sig figs) in the calculation
b. In addition/subtraction, the answer is rounded to the number of decimal places as the least precise (least decimal places) number in the calculation.
Write the answer with the correct sig figs for:
(3.84 x 10-7 x 4.010 x 1012)/0.0046 =
2.245 + 3.1 + 9.87 =
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