A short arithmetic question can cause a surprisingly big disagreement. The image asks you to solve 8 − 2 × 3 + 7 without rushing. The key is not the size of the numbers, but the order in which the operations are performed.
Standard arithmetic puts multiplication before addition or subtraction. After doing multiplication, work across the remaining addition and subtraction from left to right.
The answer is 9. First calculate 2 × 3 = 6. Then 8 − 6 + 7 = 9.
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