IMO Practice Test — Number Recognition
6 Questions • 15 min • Olympiad level
15:00
Question 1 of 6
Which number is missing? 23, 25, 27, ___, 31
26
28
29
30
Explanation: Pattern +2: 27+2=29
Question 2 of 6
How many numbers are between 12 and 18 (excluding 12 and 18)?
4
5
6
7
Explanation: Numbers: 13,14,15,16,17 → 5 numbers
Question 3 of 6
What is the 5th number after 33?
37
38
39
40
Explanation: After 33: 34(1st),35(2nd),36(3rd),37(4th),38(5th)
Question 4 of 6
Riya counts: 2, 4, 6, 8, ___, 12. What is the missing number?
9
10
11
14
Explanation: Pattern +2: 8+2=10
Question 5 of 6
Which of these is the largest? seventy-three, thirty-seven, seventy-seven, fifty-seven
seventy-three
thirty-seven
seventy-seven
fifty-seven
Explanation: 73, 37, 77, 57 → 77 is largest
Question 6 of 6
If today is day 15, and tomorrow is day 16, what day was 3 days before today?
11
12
13
14
Explanation: 15-3=12