IMO Practice Test — Place Value to 4,00,000
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
medium
How many thousands make one lakh?
10
100
1000
50
Explanation: 100 × 1000 = 1,00,000.
Question 2 of 6
medium
Make the greatest 6-digit number using 5, 0, 3, 9, 1, 7 (each once).
9,75,310
9,75,301
9,73,510
9,57,310
Explanation: Biggest digits first: 9, 7, 5, 3, 1, 0.
Question 3 of 6
medium
The smallest 6-digit number is…
1,00,000
9,99,999
1,11,111
1,00,001
Explanation: 1,00,000 is the smallest 6-digit number.
Question 4 of 6
medium
A number rounds to 50,000 (nearest ten-thousand). Which could it be?
47,000
44,000
56,000
43,000
Explanation: 47,000 rounds to 50,000; 44,000 rounds to 40,000.
Question 5 of 6
hard
The largest 6-digit number is…
9,99,999
1,00,000
9,00,000
10,00,000
Explanation: 9,99,999 is the largest 6-digit number.
Question 6 of 6
hard
Round 9,99,500 to the nearest thousand.
9,99,000
10,00,000
9,99,500
9,90,000
Explanation: Hundreds 5 rounds up, carrying through → 10,00,000.