Mingala ba!Do Now:

Take out HW and stampsheetAnswer Q below in notes. How many sig figs in each number and state the

reason why?

45.8736

.000239

.00023900

48000.

48000

3.982106

1.00040

6

3

5

5

2

4

6

All digits count

Leading 0’s don’t

Trailing 0’s do

0’s count in decimal form

0’s don’t count w/o decimal

All digits count

0’s between digits count as well as trailing in decimal form

Scientific NotationMake the following into a 3 Sig Fig number

1,558.7

.0037421

136,700,000

128,522

0.000016683

1.56x103

3.74x10-3

1.37x108

1.29x105

1.67 10-5

Multiplication and division

32.27 1.54 = 49.6958

3.68 .07925 = 46.4353312

1.750 .0342000 = 0.05985

3.2650106 4.858 = 1.586137 107

6.0221023 1.66110-24 = 1.000000

49.7

46.4

.05985

1.586 107

1.000

__ ___ __

Addition and Subtraction

.56 + .153 = .713

82000 + 5.32 = 82005.32

10.0 - 9.8742 = .12580

10 – 9.8742 = .12580

.71

82005

.1

0

Look for the last important digit

Solve each of the following problems. Show the correct set-up and always use

units. 1. Determine the number of mm in 1600 m.

2. Convert 2875 dL to liters.

3. Convert 2500 mL of hydrochloric acid (HCl) to L of HCl.

4. Convert 0.049 kg sulfur (S) to g of S

5. Convert 150 mg of acetylsalicylic acid (aspirin) to g of aspirin.

1. Convert 5.2 x 10-4 Mm of magnesium (Mg) ribbon to mm of Mg ribbon

2. Convert 0.020 kg of tin (Sn) to mg of Sn

Convert 26.7 cm of copper (Cu) wire into dm of Cu wire.

Convert 0.50 g of sodium (Na) to nanograms of Na.

How long is a microcentury in minutes?

How long is a Gigaminute in hours?