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Metric System Review For Biology Classes

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SI - International System of Units is accepted as the standard for measurement. This system is based on 10.

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**Base Units used in SI are the meter, liter, gram and second.**

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**Prefixes are attached to base units to form larger or smaller units of measurement.**

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Kilo- one thousand hecto- one hundred deka- ten base unit meter, liter, gram deci- one-tenth 1/10 centi- one-hundreth 1/100 milli- one-thousandth 1/1000

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**Mnemonic for remembering the order:**

King Henry Died By Drinking Chocolate Milk

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**Or… make up your own silly saying! **

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**A symbol is used to represent each prefix & base unit.**

Kilo- k hecto- h deka- da or D gram (g) meter (m) liter (l)

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Deci- d centi- c milli- m

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Larger & smaller units of measurement in SI are obtained by multiplying and dividing the base unit by some multiple of ten.

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**Multiply to change from larger to smaller units & divide to change from smaller to larger units.**

NOTE: the base unit must always be the same (can’t convert meter to kilograms!

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**A short cut to do this is sometimes called the stair step method**

A short cut to do this is sometimes called the stair step method. See the board & copy all examples.

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**Convert the following:**

10 m into cm 5 g into mg 200 m into km 500 L into mL 2.5 mL to L 35.5 cm to m .5 L to mL

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