The Metric System The metric system is a

The Metric System • The metric system is a measurement system based on our decimal (base 10) number system (meters, kilograms, liters). • Other countries and all scientists and engineers use the metric system for measurement.

Activator: What do you know about the history of the metric system?

Metric Prefixes • Metric Units • The metric system has prefix modifiers that are multiples of 10. Prefix Symbol Factor Number Factor Word Kilo- k 1000 Thousand Hecto. Deca. Unit Deci. Centi. Milli- h da or dk m, l, or g d c m 100 10 1. 1. 001 Hundred Ten One Tenth Hundredth thousandth

Place Values of Metric Prefixes cm cg c. L Thousandth dm dg d. L Hundredth m g L Tenth dkm dkg dk. L One hm hg h. L Ten Hundred Thousand km kg k. L mm mg m. L

Meters • A meter is the basic unit of length or distance in the Metric System • One millimeter is about the thickness of a dime.

Meters • One centimeter is about the width of a large paper clip • or your fingernail.

Meters • A meter is about the width of a doorway

Meters • A kilometer is about six city blocks or 10 football fields. • 1. 6 kilometers is about 1 mile

Gram • Grams are used to measure mass or the weight of an object in the Metric System.

Grams • A milligram weighs about as much as a grain of salt.

Grams • 1 gram weighs about as much as a small paper clip. • 1 kilogram weighs about as much as 6 apples or 2 pounds.

Liters • Liters measure liquids or capacity.

Liter • 1 milliliter is about the amount of one drop

Liter • 1 liter is half of a 2 liter bottle of Coke or other soda

Liter • A kiloliter would be about 500 2 -liter bottles of soda

Which unit would you use to measure the length of this bicycle? km m cm mm

Which unit would you use to measure the mass of a penny? km g c. L mg

Which unit would you use to measure the water in an aquarium? L m c. L mg

Which unit would you use to measure the mass of a feather? L m c. L mg

Which unit would you use to measure the mass of a student desk? kg g c. L mg

Which unit would you use to measure the mass of a whole watermelon? kg g c. L mg

Which unit would you use to measure the mass of an egg? kg g mm mg

Which unit would you use to measure a can of soup? k. L L mm m. L

Which unit would you use to measure this glass of milk? k. L L c. L m. L

Which unit would you use to measure the distance across Kansas? km m cm m. L

Which unit would you use to measure the height of a tree? km m cm mm

Which unit would you use to measure the length of a bracelet? km m cm mm

Changing Metric Units • To change from one unit to another in the metric system you simply multiply or divide by a power of 10.

To change from a larger unit to a smaller unit, you need to multiply. 1 km x 1000 = 1000 m 1 m x 100 = 100 cm 1 cm x 10 = 10 mm

Place Values of Metric Prefixes Move the decimal point to the right to multiply. cm c. L cg Thousandth dm d. L dg Hundredth m L g Tenth dkm dk. L dkg One hm h. L hg Ten Hundred Thousand km k. L kg mm m. L mg

Place Values of Metric Prefixes cm cg c. L Thousandth dm dg d. L Hundredth m g L Tenth dkm dkg dk. L One hm hg h. L Ten Hundred Thousand km kg k. L mm mg m. L

To change from smaller units to larger units you divide by a power of ten. 1000 mm ÷ 10 = 100 cm ÷ 10 = 10 dm ÷ 10 = 1 m

Place Values of Metric Prefixes Move the decimal point to the left to divide. cm c. L cg Thousandth dm d. L dg Hundredth m L g Tenth dkm dk. L dkg One hm h. L hg Ten Hundred Thousand km k. L kg mm m. L mg

Place Values of Metric Prefixes km kg k. L hm hg h. L dkm dkg dk. L m g L dm dg d. L cm cg c. L mm mg m. L 3 km 30 hm 300 dkm 30000 dm 300000 cm 3000000 mm 4 L 12 cm

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