Math Practice Problems - Scientific Notation 2

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Scientific Notation 2 - Sample Math Practice Problems

The math problems below can be generated by MathScore.com, a math practice program for schools and individual families. References to complexity and mode refer to the overall difficulty of the problems as they appear in the main program. In the main program, all problems are automatically graded and the difficulty adapts dynamically based on performance. Answers to these sample questions appear at the bottom of the page. This page does not grade your responses.

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Answers

Complexity=1, Mode=mul-div

Compute, rounding to the nearest tenth.
Sample answers: 3.4 × 10², 4.2 × 10^-5, 1.5 (not 1.5 × 10⁰ since 10⁰ = 1). Use your calculator to multiply or divide decimals.
Type sample answers as: 3.4 * 10^2, 4.2 * 10^-5, 1.5. An online calculator is provided.

Problem

Correct Answer

Your Answer

(2.4 × 10^-8) × (5 × 10⁶)

Solution
(2.4 × 10^-8) × (5 × 10⁶)
Multiply the decimal parts of each number:
2.4 × 5 = 12

Convert the new decimal into scientific notation and round it:
1.2 × 10¹

Add the powers of the exponents all together:
-8 + 6 + 1 = -1

Combine the new decimal with the new power of 10:
1.2 × 10^-1

Problem

Correct Answer

Your Answer

(8.1 × 10^-1) × (6.4 × 10⁷)

Solution
(8.1 × 10^-1) × (6.4 × 10⁷)
Multiply the decimal parts of each number:
8.1 × 6.4 = 51.84

Convert the new decimal into scientific notation and round it:
5.2 × 10¹

Add the powers of the exponents all together:
-1 + 7 + 1 = 7

Combine the new decimal with the new power of 10:
5.2 × 10⁷

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