We have hundreds of course questions with personalized recommendations + Account 100% premium
According to the order of operations rules, we first solve the expression inside of the parentheses:
We obtain the following expression:
\( 100-(30-21)= \)
Mathematics has a specific order that must be followed! Parentheses always come first in PEMDAS, so must be calculated before subtracting from 66.
Without parentheses, would equal 41 because we'd work left to right. The parentheses change the answer to 61!
Use PEMDAS: Parentheses, Exponents, Multiplication/Division, Addition/Subtraction. Some people remember it as "Please Excuse My Dear Aunt Sally!"
Solve each set of parentheses first, from innermost to outermost if they're nested. Then follow the rest of PEMDAS for the remaining expression.
Yes! You can substitute: if is correct, then should equal . Let's see: ✓
Get unlimited access to all 18 Commutative, Distributive and Associative Properties questions, detailed video solutions, and personalized progress tracking.
Unlimited Video Solutions
Step-by-step explanations for every problem
Progress Analytics
Track your mastery across all topics
Ad-Free Learning
Focus on math without distractions
No credit card required • Cancel anytime