NJSLA Number Sense and Operations 2 — Questions and Answers
Question 1: What is 15% of 80?
- 10
- 15
- 12 (Correct answer)
- 20
Correct answer: 12
15% of 80 = 0.15 × 80 = 12.
Question 2: A number is multiplied by -3, and the result is -18. What is the number?
- -6
- 6 (Correct answer)
- 54
- -54
Correct answer: 6
If -3 × n = -18, then n = -18 ÷ -3 = 6.
Question 3: What is the least common multiple (LCM) of 4 and 6?
- 2
- 24
- 12 (Correct answer)
- 8
Correct answer: 12
Multiples of 4: 4, 8, 12… and of 6: 6, 12…; the smallest shared multiple is 12.
Question 4: Which expression represents '5 less than twice a number n'?
- 5 - 2n
- 2n - 5 (Correct answer)
- 2(n - 5)
- n/2 - 5
Correct answer: 2n - 5
'Twice a number n' is 2n, and '5 less than' means subtract 5, giving 2n - 5.
Question 5: What is the value of √144?
- 12 (Correct answer)
- 14
- 11
- 16
Correct answer: 12
12 × 12 = 144, so √144 = 12.
Question 6: A price increased from $40 to $50. What is the percent increase?
- 10%
- 20%
- 25% (Correct answer)
- 15%
Correct answer: 25%
Percent increase = (10/40) × 100 = 25%.
Question 7: Which set of numbers is arranged in order from greatest to least?
- -5, -3, 0, 2
- 2, 0, -3, -5 (Correct answer)
- -3, 2, -5, 0
- 0, 2, -3, -5
Correct answer: 2, 0, -3, -5
Greatest to least means positive numbers first: 2, then 0, -3, -5.
