GED Mathematical Reasoning Arithmetic and Number Sense 3 — Questions and Answers
Question 1: What is the least common multiple (LCM) of 8 and 12?
- 16
- 24 (Correct answer)
- 48
- 96
Correct answer: 24
The LCM of 8 and 12 is 24, the smallest number divisible by both.
Question 2: A store marks up a $45 item by 40%. What is the selling price?
- $18.00
- $58.00
- $63.00 (Correct answer)
- $72.00
Correct answer: $63.00
40% of $45 is $18, and $45 + $18 = $63.
Question 3: Which of the following is an irrational number?
- 0.75
- √9
- √7 (Correct answer)
- 3/4
Correct answer: √7
√7 cannot be expressed as a fraction and its decimal never repeats, making it irrational.
Question 4: If 3/5 of a number is 24, what is the number?
- 14.4
- 30
- 40 (Correct answer)
- 72
Correct answer: 40
Divide 24 by 3/5 (multiply by 5/3): 24 × 5/3 = 40.
Question 5: What is 2.5 × 10³ written in standard form?
- 250
- 2,500 (Correct answer)
- 25,000
- 250,000
Correct answer: 2,500
10³ = 1,000, and 2.5 × 1,000 = 2,500.
Question 6: A recipe calls for 2¼ cups of flour. If you triple the recipe, how much flour is needed?
- 5¾ cups
- 6 cups
- 6¾ cups (Correct answer)
- 7 cups
Correct answer: 6¾ cups
2¼ × 3 = 9/4 × 3 = 27/4 = 6¾ cups.
Question 7: What is the absolute value of -3.7?
- -3.7
- 0
- 3.7 (Correct answer)
- 13.69
Correct answer: 3.7
Absolute value represents distance from zero, so |-3.7| = 3.7.
GED Mathematical Reasoning Arithmetic and Number Sense 3
What is the least common multiple (LCM) of 8 and 12?