# Significant Figures Worksheet Determine the number of ... - Library Significant Figures Worksheet Determine the number of ... - Library

Name _______________________Significant Figures WorksheetDetermine the number of significant figures in the following measurements. All digits aresignificant except for place holding zeros are NOT significant.1. 0.02 _______1_____ 6. 5,000.0 ______5___ 11. 1,020 ______4___2. 0.020 ______2_______ 7. 5,000. _____4_______ 12. 0.0010 _____2______3. 501 _______3_______ 8. 6,051.00 _____6______ 13. 4,200 _____2_____4. 501.1 ______4_______ 9. 0.1020 ______4_______ 14. 4,200. _____4_____5. 5, 000______1________ 10. 0.0005 ____1_____ 15. 4,200.0 ____5_____Round each of the following numbers to three significant figures16. 80,412 _______80,400_____ 21. 310, 554__311,000_______17. 0.003299 ______0.00330_____ 22. 1.29532 ____1.30______18. 30,936,300 ___30,900,000_____ 23. 19.39 ____19.4________19. 3.004 X 10 5 _____3.00 X 10 5 _______ 20. 5, 999 ____6.00 X 10 3 __________20. 2.9999 X 10 -9 _____3.00 X 10 -9 ____ 21. 1,296,423 ___1.30 X 10 6 _________When adding and subtracting measurements, the answer must be rounded to report the samedegree of accuracy as the LEAST accurate measurement (Look at the decimal places)Round all answers to the correct number of significant figures. Include units in your answers!22. 12.01 mL + 35.2 mL + 6 mL = ___53 mL_______23. 55.45 g – 28.9 g = _____26.6 g___________24. 0.15 cm + 1.15 cm + 2.051 cm = _____3.35 cm__________25. 505 kg – 450.25 kg _______55 kg______

When multiply or dividing measurements, the answer must be rounded to the same number ofsignificant figures as the measurement with the least number of significant figures.Round all answers to the correct number of significant figures. Include units in your answers!26. 1.35 m X 2.467 m = ___3.33 m 2 __________27. 1, 035 m 2 / 42 m ________25 m_______28. 0.021 cm X 3.2 cm X 100.1 cm = _____6.7 cm 3 ________29. 150 L 3 / 4 L = ______37.5 L 2 _________30. 1.252 mm X 0.115 mm X 0.012 mm = _____0.0017 mm 3 __________32. What is the difference between an exact number and a measured number? Give oneexample of each.Exact numbers have an infinite number of significant figures. There is no uncertainty. Countedobjects (6 atoms) and some unit conversions (12 inches = 1 foot), are examples of exactnumbers. Measured numbers always have some degree of uncertainty. The last number reportedis always an estimate, or “best guess”. The number of digits reported (or significant digits) isdetermined by the precision of the measuring device. An example of a measured number is 13.6cm. This measurement is interpreted as “a measurement between 13.5 cm and 13.7 cm”.

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