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Math & Measurement Techniques for Precision Calculations

Learn rounding rules, scientific notation, metric system, conversions, and the Factor Label Method for accurate calculations. Practice with examples and implement the methods easily.

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Math & Measurement Techniques for Precision Calculations

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  1. Rounding If the number to the right of the number you are rounding to is 5 or more, you round up, otherwise you do not. 12.5431875 => 12.54 with 4 sig. figs 3.14159 => 3.14 with 3 sig. figs 453.6 => 454 with 3 sig. figs

  2. Scientific notationFor very large or very small numbers Form: 1-10 x 10power Large numbers: Move decimal point to the left. 275 is 2.75 x 100 which is 2.75 x 102 150,000,000 miles is 1.5 x 108 miles Small numbers: Move decimal point to the right, power of 10 becomes negative. 0.0000007823 cm becomes 7.823 x 10-7 cm

  3. Using your calculator Multiply: (6.02 x 1023) x (2.3x 10-5) Plug in 6.02 EE 23 X 2.3 EE (-) 5 Enter

  4. The Metric System Base Units: Meter (m), Liter(L), Gram (g) The scales of these units are adjusted in powers of ten and are described by prefixes. 1000 is kilo (k) 1/100 is centi (c) 1/1000 is milli (m)

  5. Three metric to English Conversions 453.6g = 1 pound 1.06 quarts = 1 liter 2.54 cm = 1 inch

  6. The Factor Label Method Based on the fact if the numerator (top #) and the denominator (bottom #) of a fraction are equal, than the value of the fraction is equal to 1. Based on the fact that multiplying a measurement by one will not change the value of that measurement.

  7. How many eggs are there in three dozen? 12 eggs = 1 dozen

  8. Conversion factors Each equality can be used in to ways: 12 inches = 1 ft To convert inches to ft Or to convert ft to inches

  9. Convert 72.0 inches to feet using the Factor Label method. • The steps: • Find the starting point • Collect your conversions. • Come up with a plan • Apply your plan. 72.0 inches = ? feet

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