NCDAP Arithmetic 4 — Questions and Answers
Question 1: Which of the following is NOT an integer?
- -7
- 0
- 4/2
- 5/3 (Correct answer)
Correct answer: 5/3
5/3 ≈ 1.667, which is not a whole number, so it is not an integer.
Question 2: Subtract: 7⅓ − 2¾
- 4⅓
- 4 7/12 (Correct answer)
- 4½
- 5 1/12
Correct answer: 4 7/12
7⅓ = 88/12 and 2¾ = 33/12; 88/12 − 33/12 = 55/12 = 4 7/12.
Question 3: A box contains red, blue, and green marbles in the ratio 2:3:5. If there are 40 marbles total, how many are blue?
- 8
- 10
- 12 (Correct answer)
- 16
Correct answer: 12
The ratio sum is 10 parts; blue = 3/10 × 40 = 12.
Question 4: What is the result of −18 ÷ (−3)?
- −6
- 6 (Correct answer)
- −54
- 54
Correct answer: 6
A negative divided by a negative equals a positive: −18 ÷ −3 = 6.
Question 5: Round 4,867.349 to the nearest tenth.
- 4,867.3 (Correct answer)
- 4,867.35
- 4,867.4
- 4,870
Correct answer: 4,867.3
The hundredths digit is 4 (less than 5), so the tenths digit stays at 3: 4,867.3.
Question 6: A student scored 82, 91, 78, and 85 on four tests. What is the average score?
- 83
- 84 (Correct answer)
- 85
- 86
Correct answer: 84
(82 + 91 + 78 + 85) ÷ 4 = 336 ÷ 4 = 84.
Question 7: Which expression is equivalent to 5(3x − 2)?
- 15x − 2
- 8x − 7
- 15x − 10 (Correct answer)
- 5x − 10
Correct answer: 15x − 10
Distributing 5 gives 5 × 3x − 5 × 2 = 15x − 10.
NCDAP Arithmetic 4
Which of the following is NOT an integer?