Solve: 1/4 × (1/3 + 1/2) Fraction Operation Problem

Order of Operations with Mixed Fractions

Solve the following expression:

14×(13+12)= \frac{1}{4}\times(\frac{1}{3}+\frac{1}{2})=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Always solve parentheses first
00:10 Multiply denominators by numerators
00:23 Make sure to multiply numerator by numerator and denominator by denominator
00:26 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

Solve the following expression:

14×(13+12)= \frac{1}{4}\times(\frac{1}{3}+\frac{1}{2})=

2

Step-by-step solution

According to the order of operations, we will first solve the expression in parentheses.

Note that since the denominators are not common, we will look for a number that is both divisible by 2 and 3. That is 6.

We will multiply one-third by 2 and one-half by 3, now we will get the expression:

14×(2+36)= \frac{1}{4}\times(\frac{2+3}{6})=

Let's solve the numerator of the fraction:

14×56= \frac{1}{4}\times\frac{5}{6}=

We will combine the fractions into a multiplication expression:

1×54×6=524 \frac{1\times5}{4\times6}=\frac{5}{24}

3

Final Answer

524 \frac{5}{24}

Key Points to Remember

Essential concepts to master this topic
  • Order of Operations: Always solve expressions inside parentheses first
  • Technique: Find LCD of 13+12 \frac{1}{3} + \frac{1}{2} which is 6: 26+36=56 \frac{2}{6} + \frac{3}{6} = \frac{5}{6}
  • Check: Multiply result: 14×56=524 \frac{1}{4} \times \frac{5}{6} = \frac{5}{24}

Common Mistakes

Avoid these frequent errors
  • Multiplying before solving parentheses
    Don't multiply 14×13 \frac{1}{4} \times \frac{1}{3} and 14×12 \frac{1}{4} \times \frac{1}{2} separately = wrong answer 712 \frac{7}{12} ! This ignores order of operations and changes the mathematical meaning. Always solve parentheses first, then multiply the result.

Practice Quiz

Test your knowledge with interactive questions

Complete the following exercise:

\( \frac{1}{2}:\frac{3}{5}=\text{?} \)

FAQ

Everything you need to know about this question

Why do I have to solve the parentheses first?

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The order of operations (PEMDAS) requires parentheses first! If you multiply 14 \frac{1}{4} by each fraction separately, you're actually solving 14×13+14×12 \frac{1}{4} \times \frac{1}{3} + \frac{1}{4} \times \frac{1}{2} , which is a completely different problem.

How do I add fractions with different denominators?

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Find the Least Common Denominator (LCD)! For 13+12 \frac{1}{3} + \frac{1}{2} , the LCD is 6. Convert: 13=26 \frac{1}{3} = \frac{2}{6} and 12=36 \frac{1}{2} = \frac{3}{6} , then add to get 56 \frac{5}{6} .

What's the easiest way to multiply fractions?

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Multiply straight across! For 14×56 \frac{1}{4} \times \frac{5}{6} , multiply numerators: 1 × 5 = 5, then denominators: 4 × 6 = 24. Result: 524 \frac{5}{24} .

How can I check if my answer is correct?

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Work backwards! Start with 524 \frac{5}{24} and divide by 14 \frac{1}{4} : 524÷14=524×41=56 \frac{5}{24} ÷ \frac{1}{4} = \frac{5}{24} \times \frac{4}{1} = \frac{5}{6} . This should equal your parentheses result!

Why is the answer not one of the bigger fractions like 7/12?

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Remember, you're multiplying by 14 \frac{1}{4} , which makes the result smaller! Since 56 \frac{5}{6} from the parentheses gets multiplied by a fraction less than 1, the final answer 524 \frac{5}{24} must be smaller than 56 \frac{5}{6} .

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