Difference
When an expression contains several mathematical operations, they must be performed in the correct order.
A commonly used memory aid is PEMDAS:
- P — Parentheses
- E — Exponents
- M — Multiplication
- D — Division
- A — Addition
- S — Subtraction
There is an important detail here: multiplication and division have the same priority, so they are evaluated from left to right. Addition and subtraction also have the same priority and are evaluated from left to right.
Let’s Solve the Puzzle
Start with:
7 × 7 ÷ 7 − 7 + 7
First, perform the multiplication:
7 × 7 = 49
The
