This math challenge looks simple, but the order of operations determines the correct answer.
The expression is:
16 + 4 × 0 + 5
Multiplication comes first:
4 × 0 = 0
Now complete the addition:
16 + 0 + 5 = 21
The ×0 only affects the 4, not everything that comes before or after it. That small detail is where many people make a mistake.
Answer: 21.
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