Significant Figures. What is a significant figure?. The precision of measurements are indicated based on the number of digits reported. Significant figures are the digits that are reported Approximate: weight, height—anything MEASURED; no measurement is perfect.
-To a mathematician 21.70, or 21.700 is the same.
1. All digits are significant starting with the first non-zero digit on the left. (1, 2, 3, 4, 5, 6, 7, 8, 9)
**Exception to rule: In whole numbers that end in zero, the zeros at the end are not significant.
2.If zeros are sandwiched between non- zero digits, the zeros become significant.
Ex. (103) (12.06)
3. If zeros are at the end of a number that has a decimal, the zeros are significant.
Ex. (8.20); these zeros are showing how accurate the measurement or calculation are.
round to 9cm