FACTOR – LABEL Method ALWAYS works because of these two principles: A fraction equals ______ when the _______________ and __________________ are equivalent Anything ______________ by ONE is _______________ ONE NUMERATOR DENOMINATOR MULTIPLIED UNCHANGED

3 days = _________ s 255 inches = _________ m 2.54 cm = 1 inch 3 days X 255 in X 1 day 24 hr X 1 hr 60 min 60 sec 1 min X=

7,000 cm 3 = ________ in 3 600,000 s = ________ weeks 2.54 cm = 1 inch

25 m/s = ________ km/hr 180 mph = _________ m/s 1.61 km = 1 mile 1000 m = 1 km 1.61 km = 1 mile 1000 m = 1 km

Writing numbers as powers of TEN 6 x 10 x 10 x 10 x 10 x 10600,000 = 6 x 10 5 = = 7  10  10  10  10  10 = x x x x x = 7 x = 7 x 10 -5

34,000,000 =3.4x = = 72.5 = = 8 x x x x

“ TIMES TEN TO THE ” 8.2 x x x

BASE UNITS METER m LITER l or L GRAM g

Pico p TeraT Nanon GigaG 10 9 Micro  Mega M 10 6 Millim Kilo k 10 3 Centic Hecto h 10 2 Decid Deka da 10 1

8.1  L = ____________ML 25 pm = ______ cm 8.1  L X X = To base unitTo desired unit L L L 1 1 x L ML1 1 x x ML

1. Non-zeros ARE significant 1243 sig figs sig figs 2. Zeros between sig figs ARE significant 400,0016 sig figs sig figs 3. Place-holders ARE NOT significant 3001 sig figs sig figs 4. Exact zeros ARE significant sig figs.202 sig figs

1. Non-zeros ARE significant 2. Zeros between non-zeros ARE significant 3. Place-holders ARE NOT significant 4. Exact zeros ARE significant sig figs 2 sig figs 1 sig fig 3 sig figs 5 sig figs

1. Non-zeros ARE significant 2. Zeros between sig figs ARE significant 3. Place-holders ARE NOT significant 4. Exact zeros ARE significant sig figs 4 sig figs 3 sig fig 1 sig figs 3 sig figs

1 sig fig 2 sig figs 3 sig figs 4 sig figs 7 sig figs 20,000 23,000 23,500 23,460 23,456.79

8.1 m X X = m cm 2.54 cm 1 inch cm 2 sig figs Round to 2 sig figs 320 cm