The essential rule to know
The secret here is the order of operations (the famous priority):
Multiplication and division,
then addition and subtraction.
Always from left to right when they are at the same level.
Step by step
We begin, therefore, with multiplication and division:
3 × 3 = 9
3 ÷ 3 = 1
The expression becomes:
9 − 1 + 3
Next, we calculate from left to right:
9 − 1 = 8
8 + 3 = 11
Final result: 11
Why so many mistakes?
Many people make this classic mistake:
Simply calculate from left to right without respecting priorities
For example:
3 × 3 = 9
9 − 3 = 6
6 ÷ 3 = 2
2 + 3 = 5 (false)
This quick reflex is precisely the trap!
