Converting from English to Metric Units Use conversion factors that are exact by definition 1 inch = 2.54 cm 1 ounce = 28.35 g 1 quart = 0.946L or 946.

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Presentation transcript:

Converting from English to Metric Units Use conversion factors that are exact by definition 1 inch = 2.54 cm 1 ounce = g 1 quart = 0.946L or 946 mL

Metric to English Unit Comparison 1 meter = inches 1 kilogram = 2.2 pounds 1L = quarts See Your Appendix For More Unit Equations

Bookshelf is 28.0” and need to know it’s length in cm We know that 1 inch = 2.54 cm SO: Cross multiply and solve for X (28.0) x (2.54) = (X) x (1) = X

Doing Problems 1.Read problem completely 2.Determine the measured qty. in the problem and the units 3.Determine units being requested 4.Determine conversion factor that will allow you to change to the new unit

Box of cookies contains 90 cookies. How many dozen cookies is this? Measured qty is 90. Need to know how many dozen We know that 1 doz. = 12 cookies 90 cookies = 12 cookies X dozen 1 dozen = 7.5 doz.

Set up a proportion: Use this type of equivalence to change from one unit to another unit without changing the actual quantity. How many eggs are in 3.5 dozen? X= 12 eggs 3.5 dozen 1 dozen Cross multiply 12 eggs X 3.5 dozen = X (1 dozen) Divide by 1 dozen to solve for X X = 42 eggs

Another example 26 ounces = ____________ grams 1 ounce = grams SO: 26 ounces = 1 ounce X grams grams

36 inches = how many cm? A.1 inch = 2.54 cm B.Do conversion: 36 in = 1 inch X cm 2.54 cm X = cm

Another example 336 mL = ____________ quarts 1 quart = 946 mL SO: X quarts = 1 quart 336 mL 946 mL