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DECIMALS in MEASUREMENT  
Prefixes for units of length, volume, and mass in the metric system:  
Prefix  Multiply by 
milli  0.001 (1/1000) 
centi  0.01 (1/100) 
deci  0.1 (1/10) 
deka  10 
hecto  100 
kilo  1000 
LENGTH 
The standard unit of length in the metric system is the meter. 
1 millimeter = 0.001 meter 
1 centimeter = 0.01 meter 
1 decimeter = 0.1 meter 
1 kilometer = 1000 meters 
Abbreviations 
1 millimeter = 1 mm 
1 centimeter = 1 cm 
1 meter = 1 m 
1 decimeter = 1 dm 
1 kilometer = 1 km 
Length Conversion Calculator
FOR REFERENCE: One meter is about half the height of a very tall adult. A centimeter is a little less than the diameter of a dime A millimeter is about the thickness of a dime. 
MASS 
The standard unit of mass in the metric system is the gram. 
1 milligram = 0.001 gram 
1 centigram = 0.01 gram 
1 decigram = 0.1 gram 
1 kilogram = 1000 grams 
Abbreviations 
1 milligram = 1 mg 
1 centigram = 1 cg 
1 decigram = 1 dg 
1 gram = 1 g 
1 kilogram = 1 kg 
Mass Conversion Calculator
FOR REFERENCE: A gram is about the mass of a paper clip. One kilogram is about the mass of a liter of water. 
VOLUME 
The standard unit of volume in the metric system is the liter. 
1 milliliter = 0.001 liter 
1 centiliter = 0.01 liter 
1 deciliter = 0.1 liter 
1 kiloliter = 1000 liters 
Abbreviations 
1 milliliter = 1 ml 
1 centiliter = 1 cl 
1 deciliter = 1 dl 
1 liter = 1 l 
1 kiloliter = 1 kl 
FOR REFERENCE: One liter = 1000 cubic centimeters in volume. One liter is slightly more than a quart. One teaspoon equals about 5 milliliters. 
TIME 
Time conversions: 
1 minute = 60 seconds 
1 hour = 60 minutes = 3600 seconds 
1 day = 24 hours 
1 week = 7 days 
1 year = 365 1/4 days (for the Earth to travel once around the sun) 
Calendar Calculator
FOR REFERENCE: Every three calendar years will have 365 days. The fourth year is a "leap year" of 366 days (this makes up for the extra quarter day over four years). 1992, 1996, 2000, and 2004 are leap years. 
TEMPERATURE  
Celsius  Fahrenheit  Kelvin 

100  212  373  Boiling point of water 
30  86  303  A hot day 
20  68  293  Average room temperature 
0  32  273  Water melting/freezing point 
40  40  233  F and C are the same. 
90  130  183  Lowest recorded * 
Converstion Tables & Calculator
FOR REFERENCE: Degrees Celsius are used in the metric system. The boiling point of water (at sea level) is 100°C. The freezing point of water (at sea level) is 0°C. 

* 89°C / 129°F ( Vostok, Antarctica, July 1983 ) 
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