Solve: 1/2 ÷ (1/2 - 1/4) Fraction Operation Challenge

Division of Fractions with Order of Operations

Complete the following exercise:

12:1214=? \frac{1}{2}:\frac{1}{2}-\frac{1}{4}=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 Any number divided by itself always equals 1
00:12 Convert from the whole number to the corresponding proper fraction
00:23 Subtract with common denominator
00:30 Calculate the numerator
00:33 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Complete the following exercise:

12:1214=? \frac{1}{2}:\frac{1}{2}-\frac{1}{4}=\text{?}

2

Step-by-step solution

To solve the problem, 12:1214\frac{1}{2}:\frac{1}{2}-\frac{1}{4}, follow these steps:

  • Step 1: First, interpret the division 12:12\frac{1}{2} : \frac{1}{2} as multiplication by the reciprocal. This becomes 12×21\frac{1}{2} \times \frac{2}{1}.
  • Step 2: Perform the multiplication: 12×21=1×22×1=22=1. \frac{1}{2} \times \frac{2}{1} = \frac{1 \times 2}{2 \times 1} = \frac{2}{2} = 1.
  • Step 3: Next, subtract 14\frac{1}{4} from 1: 114=4414=34. 1 - \frac{1}{4} = \frac{4}{4} - \frac{1}{4} = \frac{3}{4}.

Therefore, the solution to the problem is 34\frac{3}{4}.

3

Final Answer

34 \frac{3}{4}

Key Points to Remember

Essential concepts to master this topic
  • Order Priority: Perform division before subtraction using PEMDAS rules
  • Division Method: Convert 12÷12 \frac{1}{2} ÷ \frac{1}{2} to 12×21=1 \frac{1}{2} \times \frac{2}{1} = 1
  • Check Work: Verify 114=34 1 - \frac{1}{4} = \frac{3}{4} by converting to common denominators ✓

Common Mistakes

Avoid these frequent errors
  • Performing subtraction before division
    Don't solve left to right like 1214=14 \frac{1}{2} - \frac{1}{4} = \frac{1}{4} first, then divide = wrong answer! This ignores order of operations and gives 14÷12=12 \frac{1}{4} ÷ \frac{1}{2} = \frac{1}{2} . Always complete division operations before subtraction following PEMDAS.

Practice Quiz

Test your knowledge with interactive questions

\( \frac{1}{3}+\frac{1}{4}= \)

FAQ

Everything you need to know about this question

Why do I divide before subtracting in this problem?

+

Follow PEMDAS order of operations! Division comes before subtraction, so you must solve 12÷12 \frac{1}{2} ÷ \frac{1}{2} first, then subtract 14 \frac{1}{4} from that result.

How do I divide fractions again?

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To divide fractions, multiply by the reciprocal! So 12÷12 \frac{1}{2} ÷ \frac{1}{2} becomes 12×21=22=1 \frac{1}{2} \times \frac{2}{1} = \frac{2}{2} = 1 . Remember: flip and multiply!

What if the colon symbol confuses me?

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The colon : means division in many countries! It's the same as the ÷ symbol or writing it as a fraction. So 12:12 \frac{1}{2} : \frac{1}{2} equals 12÷12 \frac{1}{2} ÷ \frac{1}{2} .

How do I subtract 1/4 from 1?

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Convert 1 to fourths first! Since 1=44 1 = \frac{4}{4} , then 4414=34 \frac{4}{4} - \frac{1}{4} = \frac{3}{4} . Always use common denominators when adding or subtracting fractions.

Can I use a calculator for this?

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Yes, but be careful with order of operations! Many calculators follow PEMDAS automatically, but some don't. It's better to understand the steps so you can solve it by hand too.

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