G8

Copyright © Swun MathCopyright © Swun Math Grade 8 Unit 3 Lesson 6 P TE

Input/Model

(Teacher Presents)

Directions: Simplify the expression. Write solution in scientific notation.

1. (1.2 × 10^2 ) × (0.8 × 10^3 )

Solution:

• Verify that each number is written in scientific notation.


• (1.2 × 10^2 ) × (0.8 × 10^3 ) not in scientific notation.


• (1.2 × 10^2 ) × (8 × 10^2 )

• (1.2 × 8) × (10^2 × 10^2 )

• 9.6 × 102 + 2

• 9.6 × 10^4

Answer: 9.6 × 10^4

2. (2.5 × 10^2 ) ÷ (5 × 10^3 )

Solution:

• Verify that each number is written in scientific notation.


• 2 .5⋅ 10

2

5⋅ 10^3

• 25.^5 ⋅^10

2

103

• 0.5⋅^10

2

103

• 0.5⋅ 10 2−3


• 0.5 × 10–1 n ot in scientific notation


• 5 × 10–2
  Answer: 5 × 10–2