1. III. Unit Conversions (p. 40 - 42)
CH. 2 - MEASUREMENT
III. Unit Conversions
(p )
C. Johannesson

2. A. SI Prefix Conversions
1. Find the difference between the exponents of the two prefixes.
2. Move the decimal that many places.
To the left
or right?
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3. A. SI Prefix Conversions=
532 m = _______ km
0.532
NUMBER
UNIT
NUMBER
UNIT
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4. A. SI Prefix Conversions
Symbol
Factor
mega- M
106
kilo- k
103
BASE UNIT
meter, gram, liter
100
deci- d
10-1
move left
move right
centi- c
10-2
milli- m
10-3
micro- 
10-6
nano- n
10-9
pico- p
10-12
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5. A. SI Prefix Conversions
0.2
1) 20 cm = ______________ m
2) L = ______________ mL
3) 45 m = ______________ nm
4) 805 dm = ______________ km 32
45,000
0.0805
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6. B. Dimensional Analysis
The “Factor-Label” Method
Units, or “labels” are canceled, or “factored” out
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7. B. Dimensional Analysis
Steps:
1. Identify starting & ending units.
2. Line up conversion factors so units cancel.
3. Multiply all top numbers & divide by each bottom number.
4. Check units & answer.
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8. B. Dimensional Analysis
Lining up conversion factors:
= 1
1 in = 2.54 cm
2.54 cm cm
1 =
1 in = 2.54 cm
1 in in
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9. B. Dimensional Analysis
How many milliliters are in 5 kL?
Conversions:1kL = 1000L &1L = 1000mL kL mL kL
1000 L
1 kL
1000 mL
1 L
= 5,000,000 mL 
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10. B. Dimensional Analysis
You have 10 kg of gold. How many Milligrams of gold do you have?
Use: 1kg=100g, 1000mg = 1 gram kg mg
10 kg
100 g
1 kg
1000 mg
1 g
=1,000,000 mg
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11. B. Dimensional Analysis
How many liters of water would fill a container with a volume of 500 cm3?
1L=1000mL, 1mL = 1cm3
cm3 L
500 cm3
1 ml
1 cm3
1 L
1000 ml
= .5 L
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12. B. Dimensional Analysis
You get 2000 mm of your hair cut off. How many meters is this?
1m=1000mm mm m
2000 mm
1 m
1000 mm
= 2 m
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13. B. Dimensional Analysis
6) The RHS football needs 550 cm for a 1st down. How many meters is this?
100cm = 1m cm m
550 cm
1 m
100 cm
= 5.5m
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14. B. Dimensional Analysis
7) I drove 5 km to school today. How many millimeters did I drive?
1000m=1km, 1m=1000mm km mm
5 km
1000 m
1 km
1000 mm
1 m
=5,000,000 mm
C. Johannesson