If you’ve ever answered “zero” when quickly reading the expression 10 − 10 × 10 + 10, you’re not alone. This seemingly simple calculation hides a very common trap, even for adults. The culprit: the order of operations. Let’s review the basics together, so you don’t make the same mistake again.
This calculation is confusing
Let’s look at the expression:
10 − 10 × 10 + 10
At first glance, it seems easy. However, many people add or subtract incorrectly, which gives an incorrect result. And if you thought you were getting 0 , you’ve fallen into the trap. The correct answer is… −80 .
The key: priority rules (PEMDAS or BODMAS)
These acronyms, taught in middle school, serve as a reminder of the order to be followed:
- P stands for Parentheses
- E for Exhibitors
- MD for Multiplication and Division
- AS stands for Addition and Subtr
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