IMO Practice Test — Large Numbers & Place Value
6 Questions • 25 min • Olympiad level
25:00
Question 1 of 6
hard
In 45,67,890, the digit 4 is in which place?
lakhs
ten lakhs
crores
thousands
Explanation: Reading from the right, 4 sits in the ten-lakhs place.
Question 2 of 6
hard
Which is greater: 4 ten-thousands or 40 thousands?
4 ten-thousands
40 thousands
They are equal
Cannot tell
Explanation: Both equal 40,000.
Question 3 of 6
medium
Round 1,52,600 to the nearest thousand.
1,52,000
1,53,000
1,50,000
1,52,600
Explanation: Hundreds digit 6 → round up to 1,53,000.
Question 4 of 6
hard
How many ten-lakhs make 1 crore?
10
100
1000
1
Explanation: 1 crore = 1,00,00,000 = 10 × 10,00,000.
Question 5 of 6
medium
A number rounds to 700 to the nearest 100. Which could it be?
740
760
650
660
Explanation: 740 rounds to 700; 760 rounds to 800.
Question 6 of 6
hard
The greatest 6-digit number using 5, 0, 3, 9, 1, 7 (each once) is…
9,75,310
9,75,301
9,73,510
9,57,310
Explanation: Biggest digits first: 9, 7, 5, 3, 1, 0.