IMO Practice Test — Multi-Digit Multiplication
6 Questions • 25 min • Olympiad level
25:00
Question 1 of 6
medium
A dozen is 12. How many eggs are in 15 dozen?
150
180
27
160
Explanation: 12 × 15 = 180.
Question 2 of 6
hard
99 × 11 = ?
1089
1099
1189
990
Explanation: 99 × 11 = 99 × 10 + 99 = 990 + 99 = 1089.
Question 3 of 6
medium
Find the missing factor: ___ × 12 = 144
10
11
12
14
Explanation: 12 × 12 = 144.
Question 4 of 6
medium
The exact answer to 49 × 51 is closest to which estimate?
2000
2500
3000
1500
Explanation: ≈ 50 × 50 = 2500 (exact 2499).
Question 5 of 6
medium
Estimate 89 × 89 to the nearest 10.
8100
8000
9000
6400
Explanation: ≈ 90 × 90 = 8100.
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.