Solve the Fraction Addition: 1/7 + 5/7 Step by Step

Fraction Addition with Same Denominators

17+57= \frac{1}{7}+\frac{5}{7}=

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Step-by-step video solution

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00:00 Solve
00:03 Add under the common denominator
00:09 Calculate the numerator
00:13 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

17+57= \frac{1}{7}+\frac{5}{7}=

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify that both fractions have the same denominator of 7.
  • Step 2: Add the numerators together: 1+5=6 1 + 5 = 6 .
  • Step 3: Place the sum of the numerators over the common denominator.

Now, let's work through the solution:

Step 1: Since both fractions, 17 \frac{1}{7} and 57 \frac{5}{7} , have the same denominator, we can directly apply the addition rule for fractions with a common denominator.

Step 2: Add the numerators 1 and 5. Performing this calculation: 1+5=6 1 + 5 = 6 .

Step 3: Place this result over the common denominator of 7. Therefore:

17+57=1+57=67 \frac{1}{7} + \frac{5}{7} = \frac{1+5}{7} = \frac{6}{7}

Therefore, the solution to the problem is 67 \frac{6}{7} .

3

Final Answer

67 \frac{6}{7}

Key Points to Remember

Essential concepts to master this topic
  • Same Denominators: Add numerators directly, keep denominator unchanged
  • Technique: Calculate 1+5=6 1 + 5 = 6 over common denominator 7
  • Check: Verify 67 \frac{6}{7} cannot be simplified further ✓

Common Mistakes

Avoid these frequent errors
  • Adding both numerators and denominators
    Don't add 17+57=614 \frac{1}{7} + \frac{5}{7} = \frac{6}{14} ! This creates a completely different value and breaks fraction addition rules. Always keep the common denominator unchanged and only add the numerators.

Practice Quiz

Test your knowledge with interactive questions

\( \)\( \frac{4}{5}+\frac{1}{5}= \)

FAQ

Everything you need to know about this question

Why don't I add the denominators too?

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The denominator tells us what size pieces we're working with. Since both fractions are sevenths, we're adding pieces of the same size, so the denominator stays 7!

What if the denominators were different?

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You'd need to find a common denominator first! Convert both fractions so they have the same denominator, then add the numerators.

Do I need to simplify my answer?

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Always check! In this case, 67 \frac{6}{7} cannot be simplified because 6 and 7 share no common factors other than 1.

How do I know if fractions have the same denominator?

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Just look at the bottom numbers! In 17+57 \frac{1}{7} + \frac{5}{7} , both bottom numbers are 7, so they have the same denominator.

Can the sum ever be bigger than 1?

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Absolutely! If your numerators add up to more than the denominator, you get an improper fraction like 97 \frac{9}{7} , which is perfectly valid.

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