IMO Practice Test — Addition & Subtraction (Large Numbers)
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
hard
A rough estimate of 3,120 + 4,880 is…
about 7,000
about 8,000
about 9,000
about 6,000
Explanation: ≈ 3,000 + 5,000 = 8,000 (exact 8,000).
Question 2 of 6
hard
A town has 12,400 men and 11,890 women. How many people in total?
23,290
24,290
24,390
23,390
Explanation: 12,400 + 11,890 = 24,290.
Question 3 of 6
medium
Estimate 7,840 − 1,960 (nearest 1000).
6,000
5,000
7,000
4,000
Explanation: 8,000 − 2,000 = 6,000.
Question 4 of 6
medium
Ravi has ₹5,000. He spends ₹1,200 and ₹2,300. How much is left?
1,500
1,600
1,400
2,500
Explanation: 5,000 − 1,200 − 2,300 = 1,500.
Question 5 of 6
hard
The sum of the smallest 4-digit number and the largest 3-digit number is…
1,099
1,999
1,000
1,998
Explanation: 1,000 + 999 = 1,999.
Question 6 of 6
hard
By how much is 8,000 greater than 3,450?
4,450
4,550
4,650
5,450
Explanation: 8,000 − 3,450 = 4,550.