# MEASUREMENTS MEASURING LENGHTS Choose the appropriate metric unit

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MEASUREMENTS MEASURING LENGHTS

Choose the appropriate metric unit to measure each item. Choose km, m, cm or mm. � 1. Distance from the earth to the moon � 2. typical room height � 3. width of an adult thumb � 4. average depth of ocean � 5. length of medium-sized car

The basic unit of length for metric measure is the meter (m) �Other commonly used units include the kilometer (km), the centimeter (cm), and millimeter (mm).

METRIC UNITS OF LENGTH WORD SYMBOL MEANING kilometer hectometer dekameter decimeter centimeter millimeter km hm da m dm cm mm 1 000 meters 10 meters 1 meter 0. 01 meter 0. 001 meter

Relationship between the prefixes used to name metric unit. It is important to understand these relationships in order to change values from one metric unit to another. thousand hundreds tens s kilometer 1 000 m hecto- deka- Ones No prefix hectomete dekameter Meter (m) r 100 m 1 m tenths decimeter 1/10 m hundredt hs thousand ths centi milli centimeter millimeter 1/100 m 1/1000 m

Rules are used to change from one metric unit to another. � 1. To change from a larger unit to a smaller unit ( moving to the right in the diagram), multiply by a power of ten. Thus, move the decimal point in the given quality one place to the right for each smaller unit until the decimal unit is reached. �x 10 � km hm da m dm cm mm

� 2. To change from smaller unit to a larger unit ( moving to the in the diagram), divide by a power of ten. Thus move the decimal point in the given quality one place to the left for each larger unit until the decimal unit is reached. km hm da m dm cm mm ÷ 10

Complete each to make a true statement. a. To change from m to da, divide by _____. b. To change from hm to dm, _____ by 1 000.

solution � 10 ( there are 10 meters in a dekameter. ) �Multiply ( You multiply when you are changing from a larger unit to a smaller unit. )

Convert each to the indicated unit � 15 hm to dm � 543 m to km

solution �A. to convert from hectometer to decimeter, we start at hectometers and move three steps to the right to obtain decimeters. �B. To convert from meters to kilometers, we start at meters and move three steps to the left to obtain kilometers

Customary Units : Length � 12 inches ( in) = 1 foot ( ft. ) � 36 inches (in. ) = 1 yard (yd. ) � 3 feet (ft. ) = 1 yard (yd. ) � 5 280 feet ( ft. )= 1 mile (mi. )

Complete each. � 8 ft = ____in. � 144 in = ______yd.

TRY THIS � Complete each. 1. To Change from m to da, divide by ____. 2. To change from m to mm, multiply by ___. 3. To change from km to da, ____ by 100. 4. 7 m = ____cm 5. 2000 mm = ____m 6. 5240 m = ______km 7. 15 ft. = _____in 8. 23 mi. = ____ft. 9. 9 yd= _____m. 10. 42 mm= _____km

Conclusion �Identify… 3 important concepts that interest you; 2 question that you want to ask; 1 idea that you need clarification.

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