Chemistry Name __________________________
Each number below represents a measured number. Determine how many “sig figs” are present in each. h) 0.00871 o) 376 v) 250 a) 1.305 b) 22 i) 3.0008 p) 20.0 w) 2500
j) 15.02 q) 0.0030 x) 25,000 c) 0.096 d) 3.50 e) 120 f) 5000 k) 7 l) 70 m) 700 r) 0.00300 s) 1,000,001 t) 0.1060
y) 0.0025
z) 0.2500
a’) 2.15 x 10 5 g) 5000.0 n) 700. u) 8 b’) 4.0 x 10 -3

Chemistry Name __________________________
Each number below represents a measured number. Perform each calculation. Give both the calculated answer and the answer rounded to the correct number of sig figs.
“Calculator Says” a) 124.590 + 76.3 ______________ b) 98 – 2.77 c) 255 × 0.046
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“You Report”
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_____________ d) 12.0 ÷ 4.0 e) 1.7 + 2.33 f) (7.00 + 3.0) ÷ 5.00 g) 500. × 18.015 h) 2.90 + 0.56 + 1.2 i) (17.35 – 1.0) x 0.007 j) 0.705 x 1.4 k) 25.7 - 8.1 l) 1.20 + 4.50 m) 3.856 ÷ 2.12 n) (12.8 – 0.5) ÷ 3.10 o) 15 + 3.3
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Challenge:
Solve for X. Report your answer with the correct number of sig figs.
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215.7 = 4.2 ( x + 7.3 )
0.745

Name ________________________
More Sig Figs!!! Period ________ Date __________
Set 1: Determine the number of significant figures in the following measurements: a) 0.0120 m b) 100.5 mL c) 101 g d) 350 cm 3
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_________ e) 0.97 km f) 1000 kg g) 180.0 mm h) 0.4986 L
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_________ i) 0.020700 s _________ j) 4.950 x 10 8 m/s _________
Set 2: Round the following quantities to the specified number of significant figures: a) 5,487,129 m to three sig figs. __________________________ b) 0.013479265 mL to six sig figs __________________________ c) 31.9547 g to four sig figs __________________________ d) 192.6739 m 2 to five sig figs __________________________ e) 786.9164 cm to three sig figs __________________________ f) 389,277,600 J to one sig fig __________________________ g) 225,834.762 cm 3 to seven sig figs __________________________ h) 0.0001541711 s to two sig figs __________________________ i) 1.29340 g to three sig figs j) 0.023489 L to three sig figs
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Set 3: Perform each calculation. Report your answer with proper units and the correct number of sig figs. NOTE: For multiple step calculations, it is best to perform the entire calculation first. Then round your final answer to the appropriate number of sig figs
_______________________ a) 651 cm × 75 cm b) 7.835 kg ÷ 2.5 L c) 14.75 L ÷ 1.20 s
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_______________________ d) 360 cm × 51 cm × 9.07 cm _______________________ e) 2.90 g + 1.5 g f) 0.0087 mol – 0.00763 mol g) 42.389 m – 12.7 m h) (7.6 g + 2.92 g) ÷ 3.1 cm 2 i) (0.54 kg + 1.33 kg) × 5.4 m 2
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_______________________ j) 690000m ÷ (5.022 h – 4.31 h) _______________________ k) 6.02 x 10 23 atoms + 4.2 × 10 l) 3.004 N × 8.46 m m) 0.3498 cm – 0.1631 cm
23 atoms _____________________
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n) 120 L + 25 L + 1.3 L ________________________ o) (98.3 kg – 14 kg) ÷ 2.56 mol ________________________
1) Determine the number of significant figures in each of the following: a) ______ 75.02mm b) ______18.90 mL d) ______ 0.0049 g e) ______ 150 cm g) _____ 101.40 g h) _____ 0.03040 km c) ______ 12 m f) ______ 150. cm i) _____ 2.00 x 10 2 mL
2) Re ‐ write the quantity 4.3840 g to show: a) 1 sig. fig. ____________________ b) 2 sig. figs. ___________________ c) 3 sig. figs. ___________________
3) Rewrite the quantity 0.0031904 kg to show: a) 1 sig. fig. ____________________ b) 2 sig. figs. ___________________ c) 3 sig. figs. ___________________
4) Rewrite the quantity 155,000 km to show: a) 1 sig. fig. ____________________ b) 2 sig. figs. ___________________ c) 3 sig. figs. ___________________
5) Round each of the following quantities to 3 significant figures: a) 16.8477 L _________________ b) 0.14986 L _________________ c) 4.203 x 10 4 km _________________ d) 0.00318756 m _________________ e) 5.6732 g f) 861.85 cm
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_________________ g) 5.0981 x 10
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3 kg _________________ h) 0.09025011 L _________________

6) Perform the following calculations and report the results with the correct number of significant figures and proper units.
Addition a) 13.297 g + 2.3 g = ______________________ b) 44.865 m + 22.04 m = ____________________ c) 150 mL + 25.3 mL = _____________________
Subtraction d) 234.00 g - 58.34 g = _____________________ e) 78.9 km - 43.42 km = ____________________ f) 53.9 mL – 22 mL = ______________________
Multiplication g) 2.642 cm x 4.50 cm = ___________________ h) 3.0 cm x 0.0425 cm x 1.005 cm = ___________________ i) 12.33 J x 2.800 s = _________________________
Division j) 14.20 cm 2 / 2.9 cm = ________________________ k) 155,000 km / 45 hr = ________________________ l) 840. g / 294.5 mL = _________________________