G8

Copyright © Swun MathCopyright © Swun Math Grade 8 Unit 3 Lesson 4 P TE

Answer Key

Extension Activity

1. False


2. True


3. True

Homework

1. 2.3 × 10-^4 – 1.5 × 10-^4
   (2.3 – 1.5) × 10-4
   0.8 × 10-4  Not in scientific notation
   8.0 × 10-5

2. 2.5 × 10^3 + 7.9 × 10^3

(2.5 + 7.9) × 10^3

10.4 × 10^3  Not in scientific notation

1.04 × 10^4

3. 9.5 × 10^3 + 4.3 × 10^4
   9.5 × 10^3 + 4.3 × 10^1 × 10^3

9.5 × 10^3 + 43.0 × 10^3

52.5 × 10^3  Not in scientific notation

5.25 × 10^4

4. 1.01 × 10^3 + 6.5 × 10^4

1.01 × 10^3 + 6.5 × 10^1 × 10^3

1.01 × 10^3 + 65.0 × 10^3

66.01 × 10^3  Not in scientific notation

6.601 × 10^4 L

5. 7.9 × 10-^6 – 6.5 × 10-^6
   (7.9 – 6.5) × 10-6
   1.4 × 10-6

0.8 × 10-^4

6. 9.2 × 10-^1 – 7.9 × 10-^1

(9.2 – 7.9) × 10-1

1.3 × 10-1