Transcript Metric Measurements

METRIC
MEASUREMENTS
Objective: Learn to identify, convert,
and compare metric units.
METRIC MEASUREMENTS
4-quarts (qt)=
8-pints (pt)=
16-cups (c)=
128 ounces (oz)
8oz=1 cup
G-LAND
1-gallon (gal)=
CHOOSING THE APPROPRIATE
METRIC UNITS
Choose the most appropriate customary unit for
each measurement. Justify your answer.
A.
The length of a car
Meter-a car can be measured with several lengths
of a doorway
B.
The mass of a skateboard
Kilograms-a skateboard’s mass can be measured
with textbooks
C.
The recommended dose of a cough syrup
Milliliters-a dose of cough syrup can be
measured by the amount of liquid in an
eyedropper.
METRIC UNITS BASE ON
POWERS OF 10
103=1,000
102=100
Thousands Hundreds
Kilo-
Hecto-
101=10
100=1
Tens
Ones
Base Unit
Meter/Liter/Gram
Deca-
1/101=1/10=0.1 1/102=1/100=0.01 1/103=1/1000=0.001
Tenths
Hundredths
Thousandths
Deci-
Centi-
Milli-
To convert metric units, multiply or divide by a power of 10
• Multiply to convert to smaller unit
• Divide to convert to larger unit
TRY THIS!!!
Convert each measure.
510 cm to meters
100 cm=1m
So divide by
100
510
510cm 
m
100
 5.1m
Move decimal
2 places left
2.3 L to milliliters
1 L=100mL
So multiply by
1000
2.3L  2.3 1000  mL
 2300mL
Move decimal
3 places right
TRY THIS!!!
Anna and Weston are measuring the mass of rocks in
science class. Anna’s rock has a mass of 480 g.
Weston’s rock has a mass of 0.05 kg. Whose rock has
the greater mass? How much greater is it?
480 1000

x
1
480  1000x
x  0.48
Write the proportion
Find the cross product
Solve for x
Since 0.48 kg>0.05 kg. Anna’s rock has the greater mass?
0.48  0.05  0.43
Subtract to find how much greater
The mass of Anna’s rock is 0.43 kg greater the Weston’s rock.
EXAMPLE 1:
Choose the most appropriate metric unit for each
measurement. Justify your answer.
A.
The amount of water a runner drinks
each day
B.
The length of a boat
C.
The mass of a car
EXAMPLE 2:
Convert each measure.
A. 530 cL to liters
B.
1,070 g to milligrams
EXAMPLE 3:
Addison buys one pumpkin that has a
mass of 3 kg and another that has a
mass of 2,150 g. Which pumpkin has
the greater mass? How much greater
is its mass?