1. Uncertainty in Measurement

2. Significant Figures #1 All non-zero digits are significant. Examples 1541526 23000.00 455

3. Significant Figures #2 All zeros between non-zero digits are significant. Examples 1012003.002 203 002003 00

4. Significant Figures #3 Leftmost zeros appearing in front of nonzero digits are not significant. Examples 0.0003 0.00 204

5. Significant Figures #4 Zeros at the end of a number and to the right of a decimal point are always significant. Examples 43.001.010 9.000

6. Significant Figures #5 Zeros at the rightmost end of a measurement but to the left of an understood decimal are not significant. Examples 000 00000 3 9 43

7. Sig. Fig Practice 123 0.123 40.506 9.8000 x 10 4 30.0 22 0.0 7080 9800 0

8. Sig. Figs – Mult./Division The answer to an multiplication/division problem should be rounded to the same number of significant figures as the measurement with the least amount of significant figures. 100.00 22.1 2210 3 SF 5 SF

9. Sig. Figs – Adding/Subtracting The answer to an addition/subtraction problem should be rounded to the same number of decimal places as the measurement with the least amount of decimal places. 100.00 22.1 122.1 0 1 DP 2 DP

10. Sig Figs & Operations 1.2 cm x 2 cm 100.0 g / 2.1 g 16.25 cm + 19.1 cm 12.23 in – 1.2620 in CalculatorAnswer 2.4 cm 2 2 cm 2 47.619 48 35.35 cm35.4 cm 10.968 in10.97 in