Solve (12-15÷3×2)/(10÷(2+3)): Order of Operations Challenge

Order of Operations with Complex Fractions

1215:3210:(2+3)= \frac{12-15:3\cdot2}{10:(2+3)}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:13 Let's solve this expression together.
00:16 First, break it down into the top and bottom parts.
00:20 Remember, we do multiplication and division before addition and subtraction.
00:26 Also, work from left to right as you go.
00:29 And always start with what's inside the parentheses.
00:39 Keep focusing on multiplication and division first. Almost there!
00:49 And that gives us the final answer.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

1215:3210:(2+3)= \frac{12-15:3\cdot2}{10:(2+3)}=

2

Step-by-step solution

We start by solving the exercise in the numerator and then solve the exercise in the denominator.

We know that multiplication and division operations come before addition and subtraction operations, so first we will divide 15:3 and then multiply the result by 2:

15:3=5 15:3=5

125×2=1210=2 12-5\times2=12-10=2

The result of the numerator is 2 and now we will solve the exercise that appears in the denominator.

It is known that according to the rules of the order of operations, the exercise that appears between parentheses goes first, so we first solve the exercise2+3=5 2+3=5

Now, we solve the division exercise:10:5=2 10:5=2

The result we get in the denominator is 2.

Finally, divide the numerator by the denominator:

22=1 \frac{2}{2}=1

3

Final Answer

1

Key Points to Remember

Essential concepts to master this topic
  • PEMDAS Rule: Parentheses first, then multiplication/division from left to right
  • Technique: Solve numerator 12-15÷3×2 = 12-5×2 = 12-10 = 2
  • Check: Verify final division: 22=1 \frac{2}{2} = 1 matches given answer ✓

Common Mistakes

Avoid these frequent errors
  • Working left to right without following order of operations
    Don't solve 12-15÷3×2 as (12-15)÷3×2 = -3÷3×2 = -2! This ignores PEMDAS and gives wrong results. Always do division and multiplication before subtraction, working left to right within those operations.

Practice Quiz

Test your knowledge with interactive questions

\( 100+5-100+5 \)

FAQ

Everything you need to know about this question

Why do I solve the top and bottom separately first?

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A fraction bar acts like grouping symbols! You must complete all operations in the numerator and denominator before dividing. Think of it as (numerator) ÷ (denominator).

Do I really need to do 15÷3 before multiplying by 2?

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Yes! Both division and multiplication have the same priority level, so you work left to right. So 15÷3×2 becomes 5×2 = 10, not 15÷6.

What if I get confused about which operations to do first?

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Remember PEMDAS: Parentheses, Exponents, Multiplication/Division (left to right), Addition/Subtraction (left to right). Write it out step by step!

How can I check if my final answer is correct?

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Substitute your result back into a calculator or work backwards. Here: 22=1 \frac{2}{2} = 1 , so if our answer is 1, then 1×2 should equal 2 ✓

Why is the answer 1 and not a decimal?

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Because both the numerator and denominator equal exactly 2! When you divide equal whole numbers, you always get 1. No decimals needed here.

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