Numerical Ability Reviewer Part 30 with Answers

Part 30 of our Numerical Ability reviewer has 20 practice questions in the style of the Civil Service Exam. Answer them in order, read the explanation after each one, and check your score against the 80% passing mark at the end. Questions and choices are reshuffled every time you retake the part.

Start Part 30

Sample questions from Part 30

Here are a few questions from this part. Take the full test to answer all 20 and get your score.

Sample question 1

Evaluate: (5 − 7)² − |6 − 8| × ∛27 − ∛(−216) + ∛(−8)

10
−22
6
2

Answer: 2

Evaluate each part first: (5 − 7)² = 4; |6 − 8| = 2; ∛27 = 3; ∛(−216) = −6; ∛(−8) = −2. Then follow the order of operations (multiplication before addition/subtraction): the expression becomes 4 − 2 × 3 − (−6) + (−2) = 2. (Note: −a² means −(a²), while (−a)² means (−a)(−a).)

Sample question 2

At dawn, the temperature in Baguio City was 5°C. It rose by 7°C, then rose by 12°C, and finally rose by 10°C. What was the final temperature?

−24°C
−34°C
36°C
34°C

Answer: 34°C

Start: 5. Add the changes: 7, 12, 10. 5 + (7) + (12) + (10) = 34°C.

Sample question 3

Simplify: (9a²b³)(5ab²) ÷ (3ab³)

15a⁴b⁸
42a²b²
15a²b²
15ab³

Answer: 15a²b²

Coefficients: (9 × 5) ÷ 3 = 15. Exponent of a: 2 + 1 − 1 = 2. Exponent of b: 3 + 2 − 3 = 2. Result: 15a²b².

Sample question 4

Evaluate: (6.5 + 1.1) ÷ 3.2 − 75% × 3.2

0.025
1.625
−0.025
−0.024

Answer: −0.025

6.5 + 1.1 = 7.6. Divide by 3.2 (= 3.2): 2.375. Multiply 75% × 3.2 = 2.4. Subtract: 2.375 − 2.4 = −0.025. (Multiplication is done before the subtraction.)

Sample question 5

Each of the numbers 67.69, 8.27, 31.69 is first rounded off to the nearest tenth. What is the sum of the rounded numbers?

107.7
107.8
107.6
107.65

Answer: 107.7

Round each: 67.69 → 67.7; 8.27 → 8.3; 31.69 → 31.7. Add: 67.7 + 8.3 + 31.7 = 107.7.

Numerical Ability Reviewer - Part 30