Solve the Expression: 6/7 - 1/2 + 3/14 Step by Step

Fraction Operations with Different Denominators

Solve the following exercise:

6712+314=? \frac{6}{7}-\frac{1}{2}+\frac{3}{14}=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solution
00:03 We want to find the least common denominator
00:06 Therefore we'll multiply by 2 and 7 respectively for the common denominator 14
00:10 Remember to multiply both numerator and denominator
00:20 Let's calculate the multiplications
00:30 Add under common denominator
00:37 Calculate the numerator, one operation at a time
00:43 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 exercise:

6712+314=? \frac{6}{7}-\frac{1}{2}+\frac{3}{14}=\text{?}

2

Step-by-step solution

To solve the expression 6712+314 \frac{6}{7} - \frac{1}{2} + \frac{3}{14} , we will follow these steps:

  • Step 1: Find a common denominator for the fractions.
  • Step 2: Convert each fraction to the common denominator.
  • Step 3: Perform the subtraction and addition as required.
  • Step 4: Simplify the result, if possible.

Let's work through the steps:

Step 1: The denominators are 7, 2, and 14. The least common multiple (LCM) of these numbers is 14.

Step 2: Convert each fraction:

  • 67 \frac{6}{7} becomes 6×27×2=1214 \frac{6 \times 2}{7 \times 2} = \frac{12}{14} .
  • 12 \frac{1}{2} becomes 1×72×7=714 \frac{1 \times 7}{2 \times 7} = \frac{7}{14} .
  • 314 \frac{3}{14} is already in the correct form as 314 \frac{3}{14} .

Step 3: Perform the operations:

  • Subtract: 1214714=514 \frac{12}{14} - \frac{7}{14} = \frac{5}{14} .
  • Add: 514+314=814 \frac{5}{14} + \frac{3}{14} = \frac{8}{14} .

Step 4: Simplify the fraction if possible. Here, 814 \frac{8}{14} simplifies to 47 \frac{4}{7} ; however, since the given choices list 814 \frac{8}{14} and it matches, there is no need for further simplification within the context of this question.

Therefore, the solution to the problem is 814 \frac{8}{14} .

3

Final Answer

814 \frac{8}{14}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Find the LCD of all denominators before adding or subtracting fractions
  • Technique: Convert 67 \frac{6}{7} to 1214 \frac{12}{14} when LCD is 14
  • Check: Verify 1214714+314=814 \frac{12}{14} - \frac{7}{14} + \frac{3}{14} = \frac{8}{14} by counting numerators ✓

Common Mistakes

Avoid these frequent errors
  • Adding denominators together instead of finding LCD
    Don't add 7 + 2 + 14 = 23 as your common denominator = impossible conversions! This creates fractions that don't exist. Always find the LCD by identifying the smallest number that all denominators divide into evenly.

Practice Quiz

Test your knowledge with interactive questions

Complete the following exercise:

\( \frac{3}{4}:\frac{5}{6}=\text{?} \)

FAQ

Everything you need to know about this question

Why can't I just add the numerators and denominators separately?

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Fractions represent parts of a whole, so you can only combine them when they represent parts of the same size. That's why you need a common denominator first!

How do I find the LCD of 7, 2, and 14?

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List the multiples: 7: 7, 14, 21... 2: 2, 4, 6, 8, 10, 12, 14... 14: 14, 28... The smallest number that appears in all lists is 14.

Do I need to simplify my final answer?

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It depends on the question! Here, 814 \frac{8}{14} simplifies to 47 \frac{4}{7} , but since the answer choices show 814 \frac{8}{14} , that's what they're looking for.

What if one fraction already has the common denominator?

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Lucky you! Like 314 \frac{3}{14} in this problem - it already has denominator 14, so you can leave it as is and just convert the others.

Can I work left to right or do I need a special order?

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With addition and subtraction of fractions, you can work left to right once they all have the same denominator. Just be careful with your positive and negative signs!

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