Solve (50-10) × 2: Order of Operations Practice

Order of Operations with Parentheses First

Solve the following equation:

(5010)×2= (50-10) \times 2 =

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Step-by-step written solution

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1

Understand the problem

Solve the following equation:

(5010)×2= (50-10) \times 2 =

2

Step-by-step solution

To solve the equation, follow these steps:

1. Start with the expression inside the parentheses: 5010 50 - 10 .

2. Calculate 5010 50 - 10 to get 40 40 .

3. Now multiply the result by 2: 40×2 40 \times 2 .

4. Calculate 40×2 40 \times 2 to get 80 80 .

Therefore, the final answer is 80 80 .

3

Final Answer

80 80

Key Points to Remember

Essential concepts to master this topic
  • PEMDAS Rule: Parentheses always come first before multiplication operations
  • Technique: Calculate (5010)=40 (50-10) = 40 , then 40×2=80 40 \times 2 = 80
  • Check: Work left to right: parentheses first gives 40, then multiply by 2 ✓

Common Mistakes

Avoid these frequent errors
  • Ignoring parentheses and multiplying first
    Don't multiply 10 × 2 = 20, then subtract from 50 = 30! This ignores the parentheses rule and gives the wrong answer. Always solve what's inside parentheses before doing any other operations.

Practice Quiz

Test your knowledge with interactive questions

\( 140-70= \)

FAQ

Everything you need to know about this question

Why can't I just work from left to right like reading?

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Math has special rules called PEMDAS that tell us the correct order. Parentheses always come first, even if they're not the leftmost part of the problem!

What if I forgot about the parentheses rule?

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If you multiply first (10×2=20 10 \times 2 = 20 ), then subtract (5020=30 50 - 20 = 30 ), you get the wrong answer! Always look for parentheses first.

How do I remember PEMDAS?

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Try the phrase "Please Excuse My Dear Aunt Sally": Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.

What if there are multiple sets of parentheses?

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Work through each set of parentheses one at a time, usually from left to right. Solve what's inside each pair completely before moving on.

Does it matter that this problem has subtraction inside the parentheses?

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No! The parentheses rule applies regardless of what operation is inside. Whether it's addition, subtraction, multiplication, or division - parentheses always go first.

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