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## Significant Figures -

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**Significant Figures-**= represent the valid digits of a number and tells us how good your instrument is.**A. Rules for Significant Figures:**Rule #1: Numbers other than zero are always significant. 2 sig figs 96 g 3 sig figs 61.4g 0.52 g 2 sig figs**Rule #2: One or more final zeros used after**• the decimal point are always significant. 4.72 Km 3 sig figs 4.7200 Km 5 sig figs 82.0 Km 3 sig figs**Rule #3: Zeros between two other significant**digits are always significant. 5.029 m 4 sig figs 306 m 3 sig figs**Rule #4: The rest of the zeros are not significant.**7000 g 1 sig figs 0.00783 3 sig figs**MORE PRACTICE**• Identify the number of sig figs 345 ml 3 0.1120 g 4 3000 kg 1 0.01 cm 1 340 ml 2*****When adding, subtracting, multiplying or dividing you**give the answer in the least number of decimal places!!**EXAMPLES:**23,345 m + 20.1 m = 23,365 m (notice we drop the .1 in our answer) 15.0 ml – 5 ml = 10 ml