33-Add-Mult-Ans

33-Add-Mult-Ans - __= ____3___ = ___0.288___ 3) Divide:...

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GCHEMI LAB ADD/SUBSTRACT/MULTIPLY/DIVIDE SIF/FIGS CONCEPT PROBLEM ANSWERS 1) Multiply or Divide ) sig/figs of answer = sig/figs of problem factor w/least number of sig/figs Ex: Multiply: 22.4 x 18.1 = 405.44 S/F = 405 Divide: 243.2/7.5 = 32.42666 S/F = 32 2) Add or Sub places right of decimal = same number places as least precise problem factor Ex: Add: 102.1 + 1.32 + .215 = 103.635 S/F = 103.6 Sub: 26.543 – 22.86 = 3.683 S/F = 3.68 3) Rounding drop digit < 5 retain digit unchanged Ex: 2.34 round to 2.3 drop digit = 5 w/other digits add 1 to retain digit Ex: 8.3517 round to 8.4 drop digit = 5 w/zeros or no digits if retain digit odd add 1 Ex: 8.75 round to 8.8 if retain digit even unchanged Ex: 8.25 round to 8.2 PROBLEM GROSS ANSWER # SIG FIGS ANSWER Note: (*) applies to addition and subtracting digits to right of decimal. 1) Multiply: 10.923 x 0.0023 = ____0.02512___ = ____2___ = __0.025___ 2) Multiply: 0.02403 x 12.0 = ____0.28836_
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Unformatted text preview: __= ____3___ = ___0.288___ 3) Divide: 18.7623/1.0081 = ___18.61154___ = ____ 5___ = ___18.612___ 4) Add: 20.987 + 43.1 = ______64.087___ = ____1*__ = ___64.1 ___ 5) Sub: 123.456 – 10.9 = _____112.556___ = ____1*__ = ___112.6__ 6) Multiply: 43.86 x 15.753 = _____690.92___ = __ __4___ =____690.9__ 7) Divide: 1250/610 = ____2.04918___ = __ __2____= ___2.0___ 8) Add: 23.9865 + 1.8 + 2.56 = _____28.346___ = ____1*___= ___28.3__ 9) Sub: 200. – 0.0012 = ____199.993___ = ____0____=___200.___ 10) Divide: 543.9/16.853 = ____32.2731___ = _____4___= ___32.27___ 11) Add: 1.874 + 0.01272 + 12.8458 = ____14.7325___ = ____3*___= __14.733_ 12) Divide: .0043/.04 = ____0.10785___ = _____1__ = ___0.1____ 13) Multiply: 3000. x 0.012345 = _____37.035___ =_____4___ = ___37.04__ 14) Sub: 89.61 –- 0.0104 = ____89.5996___ = _____2*__= ___89.60__ 15) Add: 6.023 + 23.45 + 36.5421 = ______66.151__ = _____2*__= ___66.02__ jpechunf08/2007...
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This note was uploaded on 07/28/2011 for the course CHM 2045 taught by Professor Eng during the Spring '10 term at UNF.

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