Entry Exam Category: High School Equivalency Exams
Course: HiSET
Exam: HiSET Math Practice Test
Practice Question
A medium-sized grain of sand can be approximated as a cube with an edge length of 5×10⁻⁴ meters. Which expression best represents the number of medium-sized sand grains that could be lined up side by side to result in a total length of 1 meter?
Answer Choices
- A: 2×10³
- B: 2×10⁴
- C: 2×10⁵
- D: 5×10³
- E: 5×10⁴
Correct Answer: B
Rationale: Number of grains = 1 meter / (5×10⁻⁴ meters) = 1 / 5×10⁻⁴ = 1/5 × 10⁴ = 0.2 × 10⁴ = 2×10⁴. Options: 2×10³, 2×10⁵, 5×10³, 5×10⁴ incorrect; 2×10⁴ correct.