The expression 9 + 9 × 0 + 1 is short, but it tests whether you remember the order of operations. Working strictly from left to right can lead to the wrong result.
Multiplication must be completed before addition. First, 9 × 0 = 0. Now the expression becomes 9 + 0 + 1.
Answer: 10.
The zero is the main distraction. Multiplying one term by zero does not erase the other numbers in the expression. Once that multiplication is handled correctly, the remaining calculation is simply 9 + 1.
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