Algebra Period 3 (Tuesday)

Symbols and Expressions 1-1

O³ = Order Of Operations

It’s Aunt Sally’s Rule—Please Excuse My Dear Aunt Sally

Please (XX)

Excuse E²

My Dear (or even Dear My) × ÷ or ÷ ×

Aunt Sally (Sally Aunt) + - or - +

PEMDAS

The most common mistake of O³

when you see multiplication and division—you do whichever comes first in order!!

So if you see division then multiplication, you do division first then multiplication

When you see addition and subtraction, you do whichever comes first in order!
So if you see subtraction then addition, do the subtraction first!

When you see more than one set of parentheses, do the innermost ones first, then work outwards.
They're called nested parentheses because a bird builds his nest from the inside out.