IMO Practice Test — Basic Addition
6 Questions • 15 min • Olympiad level
15:00
Question 1 of 6
What number should be added to 8 to make 15?
6
7
8
9
Explanation: 8 + 7 = 15
Question 2 of 6
3 + 5 + 2 = ?
8
9
10
11
Explanation: Add step by step: 3+5=8, 8+2=10
Question 3 of 6
Find the missing number: 7 + ___ = 14
6
7
8
9
Explanation: 7 + 7 = 14
Question 4 of 6
24 + 13 = ? (Without regrouping)
35
36
37
38
Explanation: Ones:4+3=7, Tens:2+1=3 → 37
Question 5 of 6
Which number sentence is correct?
6+4=11
8+3=10
5+6=12
7+7=14
Explanation: 7+7=14 is correct; others are wrong
Question 6 of 6
There are 15 children on the playground. 8 more join. How many children now?
21
22
23
24
Explanation: 15 + 8 = 23