Unit 1

1. Unit 1 Lesson 6

2. Do Now Add the following: • 2/3 + 1/6 = 4/6 + 1/6 = 5/6 • ¾ - ½ = 3/ 4 - 2/4 = 1/4 3. 1/x + 1/y = 1y/xy + 1x/xy = y + x/xy

3. Quiz/Review Simplify: 2. Draw the graph and express as an inequality • (-2, 6] 4. (-3, 7] U (3, 10]

4. Objectives and HW • Be able to convert from scientific notation to decimal form • Be able to convert from decimal form to scientific notation • Be able to calculate using scientific notation HW: Lesson 6

5. Scientific Notation • 1 ≤ a ˂ 10; x = a X 10^n • Positive exponent  bigger number Negative exponent  smaller number 3. Decimal moves to the right  number gets bigger Decimal moves to the left  number gets smaller

6. Convert from scientific notation to decimal form: Ex. 1 4.5 X 10^3 Positive exp.; number will be biggermove decimal to the right 3 spaces Ans: 4500 Ex. 2 5.6 X 10^-4 Neg. exp.; number will be smallermove decimal to the left 4 places Ans: .00056

7. Convert from decimal form to scientific notation Ex. 1 23000 Number will be smaller; exp. will be positivemove decimal to the left 4 places Ans: 2.3 x10^4 Ex. 2 .0067 Number will be bigger; exp. will be neg move decimal 3 places to the right Ans: 6.7 X 10^ -3

8. Calculating w/ Scientific Notation • Same bases, subtract exponents 2. Divide the number part of scientific notation Ex. (3.1 X 10^7)/(1.2 X 10^-3) Exponents: 7 - -3 = 7 + 3 = 10 Divide numbers: 3.1 / 1.2 = 2.6 Ans: 2.6 X 10^10

9. Begin HW- Lesson 6, p. 24 Use examples on p. 23-24 as reference as needed