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SI Measurements(also known as “metric system”)
• “SI” stands for “System International” or “International System of Measurement”
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(2013)
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Why is the Metric System
better?
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–Common Language used by all scientists
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–Based on multiples (units) of 10
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–Multiply or divide by 10’s when converting
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–We only move the decimal point when converting
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–determine “how many” of a unit
–kilo-–milli-–centi-
PREFIXES
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BASE UNITS•METER•LITER•GRAM•SECOND•DEGREES CELSIUS
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METER = m • measures distance or length• LENGTH:the distance between
two points• Measure with metric ruler or metric ruler or
meter stickmeter stick
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LITERS = L
Measure with graduated cylindergraduated cylinder
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length X width X heightlength X width X height
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GRAMS = gg
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GRAMS = gg • Measure mass with triple beam triple beam
balancebalance
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oCELSIUS = ooCC• Measures temperature•
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Measured with a thermometerthermometer
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PREFIXES
k = kilo- (means “10001000”)h = hecto-(means “100100”)da = deca-(means “1010”) BASE UNIT (liter, meter, gram)
d = deci-(means “1/10” or 0.11/10” or 0.1)c = centi- (means “1/1001/100” or .01)m = milli- (means “1/10001/1000” or .001)
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Easy way to remember the order of prefixes:
Kids Have
Dreams But
DreamsCost
Money
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Metric Conversions
Ladder Method
T.
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KILO1000 HECTO
100 DEKA10
DECI0.1 CENTI
0.01 MILLI0.001
Meters
LitersGrams
Ladder Method
1st – Determine your starting point.
2nd – Count the “jumps” to your ending point.
3rd – Move the decimal the same number of jumps in the same direction.
4 km = _________ m
12
3
How many jumps does it take?
Starting Point
Ending Point
4.1
__
.2
__
.3__
.= 4000 m
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Try these conversions using the ladder method.
1000 mg = _______ g 1 L = _______ mL 160 cm = _______ mm 14 km = _______ m 109 g = _______ kg 250 m = _______ km
Conversion Practice
Compare using <, >, or =.
56 cm 6 m 7 g 698 mg
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Write the correct abbreviation for each metric unit.
1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____
2) Meter _____ 5) Millimeter _____ 8) Centimeter _____
3) Gram _____ 6) Liter _____ 9) Milligram _____
10) 2000 mg = _______ g 15) 5 L = _______ mL 20) 16 cm = _______ mm
11) 104 km = _______ m 16) 198 g = _______ kg 21) 2500 m = _______ km
12) 480 cm = _____ m 17) 75 mL = _____ L 22) 65 g = _____ mg
13) 5.6 kg = _____ g 18) 50 cm = _____ m 23) 6.3 cm = _____ mm
14) 8 mm = _____ cm 19) 5.6 m = _____ cm 24) 120 mg = _____ g
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Compare using <, >, or =.
25) 63 cm 6 m 27) 5 g 508 mg
29) 1,500 mL 1.5 L
26) 536 cm 53.6 dm 28) 43 mg 5 g
30) 3.6 m 36 cm