IMO Practice Test — Multi-Digit Multiplication
6 Questions • 25 min • Olympiad level
25:00
Question 1 of 6
hard
Which gives the largest product?
20 × 30
25 × 25
10 × 60
40 × 15
Explanation: 25 × 25 = 625; the others all equal 600.
Question 2 of 6
medium
Estimate 89 × 89 to the nearest 10.
8100
8000
9000
6400
Explanation: ≈ 90 × 90 = 8100.
Question 3 of 6
hard
Without exact calculation, which product is more than 2000?
38 × 41
30 × 60
45 × 45
19 × 99
Explanation: 45 × 45 = 2025 (>2000); 30×60=1800, 38×41≈1558, 19×99≈1881.
Question 4 of 6
medium
Find the missing factor: ___ × 12 = 144
10
11
12
14
Explanation: 12 × 12 = 144.
Question 5 of 6
medium
Tickets cost ₹40 each. How much for 25 tickets?
₹900
₹1000
₹1100
₹650
Explanation: 40 × 25 = ₹1000.
Question 6 of 6
hard
A school orders 36 boxes of chalk with 144 sticks each. How many sticks in all?
5184
5084
5200
4184
Explanation: 144 × 36 = 5184.