1. SI Prefixes
AKA
Metric Prefixes

2. Common Useful Prefixes Prefix Symbol Sci Not
micro m
milli m
centi c
deci d
deka da 101
hecto h 102
kilo k 103
mega M 106
You are expected to know these

3. Using Prefixes
How do you express one-hundredth of a meter? What do you call it?
10-2 m is a
centimeter (cm)
Recall: (1/100) of a dollar is a cent

4. Using Prefixes What do you call 1000 meters?
A kilometer
How is it written?
103 m or km

5. Using Prefixes What do you call a million grams?
A megagram
How is it written?
106 g = Mg

6. Using Prefixes What do you call a millionth of a second?
A microsecond
How is it written?
10-6 sec or ms

7. Using Prefixes What do you call 106 phones?
A megaphone!
<<<>>>
How would you write “microphone” using an SI prefix?
10-6 phones
LOL!

8. Using Prefixes What do you call 10-2 pedes?
A centipede!

9. Using Prefixes How about 10-9 goats?
a billionth or 10-9 is a “nano”
10-9 goats = a nanogoat

10. A Useful Prefix Chart 106--103 102 101 100 10-1 10-2 10-3--10 M k h da mass d c m m length vol
Kingwood
High
does
math
during
class
Monday
3.45 m = ? cm solve using the above
c is 2 steps to right of meter ANS: 3.45x102 cm

11. A Useful Prefix Chart 106--103 102 101 100 10-1 10-2 10-3--10 M k h da mass d c m m length vol
952 mm = ? m solve using the above
m is 3 steps to left of mm
ANS: m

12. A Useful Prefix Chart 106--103 102 101 100 10-1 10-2 10-3--10 M k h da mass d c m m length vol
0.735 km = ? cm solve using the above
cm is 5 steps to right of km
ANS: x 105 cm =? in Sci Notation
= 7.35 x 104 cm =73,500 cm

13. Use the track method to calculate how many cm are in 54 km
54 km m cm
1 km m
ANS: 54x105 cm
Recall: km to m & then m to cm
Move from prefix unit to fundamental unit, then
Move from fundamental to other prefix unit
Can you write it in scientific notation?
As a regular number?
5.4 x 106 cm or 5,400,000