September 9th
Questioning the professor: density problem on p. 43, Self-Check 2.4
Test
Pass out the test and go over a few points.
Review Significant Figures
How many significant figures are there in each of the following?
Constants in calculations
Calculators
Scientific notation (continued)
Powers of 10
Converting to scientific notation:
Converting from scientific notation:
Graphs
MathGoodies graphs pages:
Extrapolating: put student heights in order, graph height vs. rank by height
Extrapolating: line goes up, curves down
Test
Pass out the test and go over a few points.
Review Significant Figures
How many significant figures are there in each of the following?
- 14
- 8
- 9004
- 3.14159
- 860300
- 0.00099810
- 0.001
Constants in calculations
Calculators
Scientific notation (continued)
Powers of 10
- 10-9 = 0.000000001 (nano-)
- 10-6 = 0.000001 (micro-)
- 10-3 = 0.001 (milli-)
- 10-2 = 0.01 (centi-)
- 10-1 = 0.1
- 100 = 1
- 101 = 10
- 102 = 100
- 103 = 1000 (kilo-)
- 106 = 1,000,000 (mega-)
- 109 = 1,000,000,000 (giga-)
Converting to scientific notation:
- Copy your digits
- Want to end up with one non-zero digit to the left of the decimal
- Count the places you move your decimal
- Positive if moved decimal left, negative if to the right
Converting from scientific notation:
- Copy your digits
- Move your decimal to the right if exponent is positive, to the left if negative:
fill in with zeros if needed (remember number lines?)
Graphs
MathGoodies graphs pages:
Extrapolating: put student heights in order, graph height vs. rank by height
Extrapolating: line goes up, curves down