At first glance, the puzzle seems simple:
90 − 10 ÷ 2 + 8 = ?
Many people rush to answer because the numbers look easy. That’s exactly why this riddle tricks so many people.
The Most Common Mistake
A lot of people solve the equation from left to right:
- 90 − 10 = 80
- 80 ÷ 2 = 40
- 40 + 8 = 48
So they answer 48.
Unfortunately, that’s not correct.
A
B
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ANSWER:
Remember the Order of Operations
In mathematics, you don’t simply calculate from left to right. You must follow the order of operations:
- Division and multiplication first.
- Addition and subtraction afterward.
- If operations have the same priority, work from left to right.
The expression is:
90 − 10 ÷ 2 + 8
First, perform the division:
10 ÷ 2 = 5
Now the equation becomes:
90 − 5 + 8
Next, work from left to right:
90 − 5 = 85
85 + 8 = 93
The Correct Answer
✅ 93
Why This Puzzle Is So Effective
This riddle isn’t really testing your arithmetic skills. It’s testing whether you remember the fundamental rule of mathematics: follow the order of operations before doing any calculations.
The numbers are easy, but the temptation to solve everything from left to right causes many people to miss the correct answer.
Final Answer: 93 🎯
