Part 29 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 29Sample questions from Part 29
Here are a few questions from this part. Take the full test to answer all 20 and get your score.
Sample question 1
The numbers 7.16, 5.14, 15.88 are each rounded off to the nearest tenth. By how much does the sum of the rounded numbers differ from the exact sum of the original numbers? (Give rounded sum minus exact sum.)
- 0.2
- −0.02
- 0.02
- 0.12
Answer: 0.02
Rounded values: 7.2 + 5.1 + 15.9 = 28.2. Exact sum: 7.16 + 5.14 + 15.88 = 28.18. Rounded − exact = 28.2 − 28.18 = 0.02.
Sample question 2
100 is 25% of what number?
- 500
- 133.3
- 125
- 400
Answer: 400
25% of the number = 100, so the number = 100 ÷ 25/100 = 100 × 100 ÷ 25 = 400.
Sample question 3
Evaluate: (3−1 × 91) ÷ 271
- 1/9
- 9
- 1/3
- 81
Answer: 1/9
Write every base as a power of 3: 9 = 32 and 27 = 33. Then (3−1 × 32) ÷ 33 = 3−1 + (2) − (3) = 3−2 = 1/9.
Sample question 4
What is 152.1 ÷ 100?
- 0.1521
- 0.01521
- 15.21
- 1.521
Answer: 1.521
Dividing by 100 moves the decimal point 2 places to the left: 1.521.
Sample question 5
What is √196?
- 16
- 14
- 13
- 15
Answer: 14
14 × 14 = 196, so √196 = 14.