IMO Practice Test — Percentages
6 Questions • 25 min • Olympiad level
25:00
Question 1 of 6
hard
3 out of 4 is the same as what percent?
34%
75%
43%
70%
Explanation: 3/4 = 75/100 = 75%.
Question 2 of 6
hard
15% of 200 = ?
15
30
45
60
Explanation: 10% = 20 and 5% = 10, so 15% = 30.
Question 3 of 6
hard
Which set are all equal?
1/2, 0.5, 50%
1/4, 0.4, 40%
1/5, 0.5, 5%
3/4, 0.34, 34%
Explanation: 1/2 = 0.5 = 50%.
Question 4 of 6
medium
Which is more than a whole?
99%
100%
150%
50%
Explanation: 150% is more than 100% (the whole).
Question 5 of 6
hard
A class of 40 has 25% absent. How many are present?
10
30
25
15
Explanation: 25% of 40 = 10 absent, so 40 − 10 = 30 present.
Question 6 of 6
hard
2/5 as a percentage is…
25%
40%
45%
52%
Explanation: 2/5 = 40/100 = 40%.