Important SI Standard Units

Quantity Unit Symbol
length meter m
mass kilogram kg
temperature Kelvin K
time second s

SI Prefixes

When I teach I do not use any negative exponents. Giving the larger quantity "1" allows me to not worry about the negative exponents.

Prefix Symbol Multiplyer Power of 10
tera- T 1,000,000,000,000 1012
giga- G 1,000,000,000 109
mega- M 1,000,000 106
kilo- k 1,000 103
base g, m, L, s    
deci- d 10 101
centi- c 100 102
milli- m 1,000 103
micro- μ 1,000,000 106
nano- n 1,000,000,000 109
pico- p 1,000,000,000,000 1012
femto- f 1,000,000,000,000,000 1015

Conversions

Think of it like a memo:

TO: where you are going

FROM: where you are coming from

Common Conversion Factors

Length 1 km = 0.6214 mi
1 m = 1.094 yd
1 in = 2.54 cm
Mass 1 kg = 2.205 lb
1 lb = 453.39 g
Volume 1 L = 1000 mL = 1000 cm3
1 L = 1.057 qt
1 gal = 3.785 L