Here is a quick math puzzle that looks simple on the page: 8 + 6 × 2 − 5 = ? You do not need a calculator, but you do need to remember one important rule from math class.
Try Solving It First
Many people instinctively read an expression from left to right. With addition, multiplication, and subtraction in the same line, that approach can produce the wrong result. Give yourself a moment to decide which operation should come first.
The numbers are small on purpose. This puzzle tests the method you use rather than how quickly you can calculate.
The Correct Answer Is 15
According to the standard order of operations, multiplication comes before addition and subtraction. First calculate 6 × 2, which equals 12. The expression becomes 8 + 12 − 5. Now work from left to right: 8 + 12 = 20, and 20 − 5 = 15.
Why People Disagree
If someone adds 8 and 6 before multiplying, they will get a different number. But there are no parentheses telling us to do that. Following the ordinary math rules gives one clear answer. Send the puzzle to a friend and see whether they remember to multiply first.
