IMO Practice Test — Place Value to 4,00,000
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
hard
What is the largest number that rounds to 2,00,000 to the nearest lakh?
2,49,999
2,50,000
2,99,999
2,40,000
Explanation: 2,49,999 rounds down to 2,00,000; 2,50,000 rounds up.
Question 2 of 6
medium
How many 6-digit numbers are there in all?
9,00,000
1,00,000
10,00,000
99,999
Explanation: From 1,00,000 to 9,99,999 there are 9,00,000 numbers.
Question 3 of 6
hard
Make the smallest 6-digit number using 5, 0, 3, 9, 1, 7 (no leading zero).
1,03,579
1,35,790
0,13,579
3,01,579
Explanation: Smallest non-zero first (1), then 0, 3, 5, 7, 9.
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
medium
How many thousands make one lakh?
10
100
1000
50
Explanation: 100 × 1000 = 1,00,000.
Question 6 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.