IMO Practice Test — Comparing, Ordering & Rounding
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
medium
Make the smallest 5-digit number using 3, 0, 7, 1, 9 (no leading zero).
03,179
10,379
13,079
30,179
Explanation: Smallest non-zero first: 1, then 0, 3, 7, 9.
Question 2 of 6
medium
Make the greatest 5-digit number using 3, 0, 7, 1, 9 (each once).
97,310
97,130
93,710
73,910
Explanation: Biggest digits first: 9, 7, 3, 1, 0.
Question 3 of 6
hard
Which list is correctly ordered SMALLEST to LARGEST?
9,899; 9,900; 9,989
9,989; 9,900; 9,899
9,900; 9,899; 9,989
9,989; 9,899; 9,900
Explanation: 9,899 < 9,900 < 9,989.
Question 4 of 6
medium
A number rounds to 700 (nearest 100). Which could it be?
740
760
650
660
Explanation: 740 rounds to 700; 760 rounds to 800.
Question 5 of 6
medium
What number is just before 50,000?
49,999
50,001
49,990
40,999
Explanation: One less than 50,000 is 49,999.
Question 6 of 6
medium
Round 6,549 to the nearest 1000.
6,000
7,000
6,500
6,600
Explanation: The hundreds digit is 5, so round up to 7,000.