33-Add-Mult - 3 Divide 18.7623/1.0081 = = = 4 Add 20.987...

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GCHEM I LAB ADD/SUBSTRACT/ MULTIPLY/ DIVIDE SIF/FIGS CONCEPT PROBLEMS 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 adding and subtracting and significant digits to right of decimal. 1) Multiply: 10.923 x 0.0023 = ______________ = _________ = ___________ 2) Multiply: 0.02403 x 12.0 = ______________ = _________ =___________
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Unformatted text preview: 3) Divide: 18.7623/1.0081 = ______________ = __________ =___________ 4) Add: 20.987 + 43.1 = ______________ = *_________ = ___________ 5) Sub: 123.456 – 10.9 = ______________ = *_________ = ___________ 6) Multiply: 43.86 x 15.753 = ______________ = __________= ___________ 7) Divide: 1250/610 = ______________ = __________= ___________ 8) Add: 23.9865 + 1.8 + 2.56 = ______________ = *_________= ___________ 9) Sub: 200. – 0.0012 = ______________ = *_________= ___________ 10) Divide: 543.9/16.853 = ______________ = ___________=___________ 11) Add: 1.874 + 0.01272 + 12.8458 = ______________ = *__________=___________ 12) Divide: .0043/.04 = ______________ = ___________=___________ 13) Multiply: 3000. x 0.012345 = ______________ = ___________=___________ 14) Sub: 89.61 – 0.0104 = ______________ = *__________=___________ 15) Add: 6.023 + 23.45 + 36.5421 = ______________ = *__________=___________ Jpechunf12/2005...
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