2. Unit Conversions MEASUREMENT

3. Number vs. Quantity Quantity - number + unit UNITS MATTER!!

4. The Metric System Easier to use because it is based on powers of 10. A metric unit has two parts: A prefix and a base unit Example cm, mL, mg The prefix tells you how many times to divide or multiply by 10

5. Some Base Units Length - meter(m) - more than a yard Mass - grams(g) - about a raisin Volume - Liter(L) - half of a two liter bottle

6. Some Prefixes Mega M 1000000 times kilo k 1000 times Hecto h 100 times Deka dk 10 times BASE deci d 1/10 centi c 1/100 milli m 1/1000 Micro µ 1/1000000 Nano n 1/1000000000 Pico p 1/1000000000000

7. Intro to Dimensional Analysis How long can you hold your breath? Convert it to DAYS!

8. Dimensional Analysis The “Factor-Label” Method –Units, or “labels” are canceled, or “factored” out

9. 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.

10. Conversion Factors Conversion factor- a fraction based on a definition and equal to 1 –Example: 1 cm = 0.01 m Conversion factors possible: 1 cm 0.01 m 0.01 m OR 1 cm

11. Dimensional Analysis Your European hairdresser wants to cut your hair 8.0 cm shorter. How many inches will he be cutting off? 8.0 cm1 in 2.54 cm = 3.2 in cmin

12. F a c t o r - L a b e l C o n v e r t 1 0 0 0 g r a m s t o p o u n d s When 1 pound is equal to 454 g. g  lbs 1 0 0 0 g 1 p o u n d 4 5 4 g = 2. 2 p o u n d s

13. Dimensional Analysis Taft football needs 550 cm for a 1st down. How many feet is this? 550 cm 1 in 2.54 cm = 18 ft cmft 1 ft 12 in

14. Dimensional Analysis If there are 5280 ft in 1 mile, and you run 8.5 miles, how many cm did you run? 1 in = 2.54 cm

15. Questions? “The ultimate measure of a person is not where they stand in moments of comfort and convenience, but where the stand in times of challenge and controversy.”