We have hundreds of course questions with personalized recommendations + Account 100% premium
According to the order of operations, we first solve the exercise within parentheses:
Now we obtain:
\( 100-(30-21)= \)
Math has a special order called PEMDAS (Parentheses, Exponents, Multiplication/Division, Addition/Subtraction). Parentheses always come first - they're like a math container that must be opened before anything else!
Work on the innermost parentheses first, then work your way outward. Think of it like peeling an onion - start from the center and work out layer by layer.
Yes! Writing first, then helps you avoid mistakes and makes it easy to check your work.
Huge difference! , but . The parentheses change everything!
Think of parentheses as math's most important rule. They're like a stop sign - you must deal with them before moving on. Practice saying 'Parentheses first!' before starting any problem.
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