Significant Figures. Used to report all precisely known numbers + one estimated digit. Rule #1. Every nonzero digit is significant Examples: 24 = 2 3.56 = 3 7 = 1. Rule #2. Zeros between non-zeros are significant Examples: 7003 = 4 40.9 = 3 . Rule #3.
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Used to report all precisely known numbers + one estimated digit
24 = 2
3.56 = 3
7 = 1
7003 = 4
40.9 = 3
0.00024 = 2
0.453 = 3
43.00 = 4
1.010 = 4
1.50 = 3
300 = 1
27,300 = 3
If a decimal point is present, start on the Pacific (P) side and begin counting at the first non-zero digit all the way to the end.
If a decimal is absent, start on the Atlantic (A) side and begin counting at the first non-zero digit all the way to the end.
123.003 = decimal present, start on “P” side, begin counting
Answer = 6
204,000 = decimal absent, start on “A” side, begin counting at first non-zero digit until you hit the end of the number.
Answer = 3
Your answer can’t have more sig. figs. than the number in the problem with the least amt. of sig. figs.
Example = 60.56227892 x 35.25
Calculator says – 2134.890832 (wrong)
Answer - 2135
Answers can’t have more numbers to the right of the decimal point than the number in the problem with the least amt. of numbers to the right of the decimal point.
Example = 24.1 + 3.35 + 2.23
Calculator says – 29.68 (wrong)
Answer – 29.7