IMO Practice Test — Large Numbers & Place Value
6 Questions • 25 min • Olympiad level
25:00
Question 1 of 6
hard
Round 9,49,999 to the nearest lakh.
9,00,000
10,00,000
9,50,000
9,40,000
Explanation: 9,49,999 is below 9,50,000, so it rounds down to 9,00,000.
Question 2 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 3 of 6
medium
The greatest 5-digit number using 3, 0, 7, 1, 9 (each once) is…
97,310
97,130
93,710
73,910
Explanation: Place the biggest digits first: 9, 7, 3, 1, 0.
Question 4 of 6
hard
What is the greatest whole number that rounds to 50 when rounded to the nearest 10?
54
55
59
44
Explanation: 54 rounds to 50; 55 rounds up to 60.
Question 5 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 6 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.