AnswersFL-1205070-MJ Grade 8 Pre-Algebra Summer 2026Operations with Scientific Notation

Addition and Subtraction with Scientific Notation Answers

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A human hair was measured to have a diameter of inches. The width of a piece of paper was measured to be inches thick. In scientific notation, how much thicker is the piece of paper than the hair?

Question illustration
A
inches
Option A
B
inches
Option B
C
inches
Option C
D
inches
Option D
2
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Find the sum of the numbers. Express your answer in scientific notation.

Question illustration
A
6.654 times 10 Superscript 10
Option A
B
8.49 times 10 Superscript 10
Option B
C
6.654 times 10 Superscript 11
Option C
D
8.49 times 10 Superscript 11
Option D
3

Which numbers are written in scientific notation? Check all that apply.

A
0.87 times 10 Superscript 8
Option A
B
15.489 times 10 Superscript 6
Option B
C
10.1 times 10 Superscript negative 12
Option C
D
7.08 times 10 Superscript 6
Option D
E
1.2345 times 10 Superscript negative 1
Option E
4

The steps to determine the sum are shown.Step 1. Rearrange the expression: Step 2. Add the coefficients: Step 3. Write in scientific notation: What is the value of in Step 3?

Question illustration
Answer not available
5

Find the difference. Express the answer in scientific notation.

Question illustration
A
8.1 times 10 Superscript 19
Option A
B
0.81 times 10 Superscript 20
Option B
C
8.1 times 10 Superscript 21
Option C
D
0.81 times 10 Superscript 40
Option D
6

Add and subtract the values. Express your answer in scientific notation.

Question illustration
A
7.2 times 10 Superscript 5
Option A
B
8.19 times 10 Superscript 5
Option B
C
8.41 times 10 Superscript 5
Option C
D
9.4 times 10 Superscript 5
Option D
7

Find the sum of the numbers. Express your answer in scientific notation.

Question illustration
A
6.4183 times 10 Superscript 11
Option A
B
8.23 times 10 Superscript 12
Option B
C
1.894 times 10 Superscript 13
Option C
D
2.471 times 10 Superscript 13
Option D
8

Find the sum. Express the answer in scientific notation.

Question illustration
A
7.69 times 10 Superscript 6
Option A
B
9.471 times 10 Superscript 6
Option B
C
7.69 times 10 Superscript 12
Option C
D
9.471 times 10 Superscript 12
Option D
9

Find the sum. Express the answer in scientific notation.

Question illustration
A
1.328 times 10 Superscript 8
Option A
B
1.328 times 10 Superscript 10
Option B
C
13.28 times 10 Superscript 9
Option C
D
13.28 times 10 Superscript 18
Option D
10

A pool was filled with gallons from one hose and gallons from another hose. What is the total amount of water in the pool? Express the answer in scientific notation.

Question illustration
A
gallons
Option A
B
gallons
Option B
C
gallons
Option C
D
gallons
Option D

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