This quick arithmetic puzzle is easy to misread if you calculate strictly from left to right. The expression is 9 + 3 × 0 + 4.
Answer: 13.
Multiplication comes before addition, so calculate 3 × 0 first. That equals 0. The expression then becomes 9 + 0 + 4, which equals 13.
These short puzzles are a good reminder that the order of operations matters even when the numbers themselves are simple. If you got 13 on your first try, you avoided the most common trap.


