Solve the Fraction Addition: 1/4 + 1/8 Step by Step

Fraction Addition with Common Denominators

Solve the following exercise:

14+18=? \frac{1}{4}+\frac{1}{8}=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Multiply the fraction by 2 to get a common denominator
00:07 Remember to multiply both numerator and denominator
00:15 Calculate the multiplications
00:20 Add under common denominator
00:24 Calculate the numerator
00:28 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:

14+18=? \frac{1}{4}+\frac{1}{8}=\text{?}

2

Step-by-step solution

To solve the problem of adding the fractions 14 \frac{1}{4} and 18 \frac{1}{8} , follow these steps:

  • Step 1: Identify the denominators: 4 and 8. We need a common denominator to add the fractions.
  • Step 2: Find the least common multiple (LCM) of 4 and 8. The smallest number that both 4 and 8 can divide is 8, so our common denominator will be 8.
  • Step 3: Convert 14 \frac{1}{4} to a fraction with denominator 8. To do this, multiply both the numerator and the denominator of 14 \frac{1}{4} by 2:
    • 14=1×24×2=28 \frac{1}{4} = \frac{1 \times 2}{4 \times 2} = \frac{2}{8}
  • Step 4: Now add the fractions: 28+18 \frac{2}{8} + \frac{1}{8} .
    • Since the fractions now have the same denominator, add the numerators: 2+1=3 2 + 1 = 3 , while keeping the denominator 8.
    • The result is 38 \frac{3}{8} .
  • Step 5: Ensure the fraction is in its simplest form. The fraction 38 \frac{3}{8} is already simplified, as 3 and 8 have no common factors other than 1.

Therefore, the sum of 14+18 \frac{1}{4} + \frac{1}{8} is 38 \frac{3}{8} .

Once we compare this with the given answer choices, we find that our final result, 38 \frac{3}{8} , matches choice 1.

Hence, the correct answer to the problem is 38 \frac{3}{8} .

3

Final Answer

38 \frac{3}{8}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Find common denominator before adding numerators together
  • Technique: Convert 14 \frac{1}{4} to 28 \frac{2}{8} by multiplying by 2
  • Check: Verify 28+18=38 \frac{2}{8} + \frac{1}{8} = \frac{3}{8} makes sense ✓

Common Mistakes

Avoid these frequent errors
  • Adding numerators and denominators separately
    Don't add 1+1=2 and 4+8=12 to get 212 \frac{2}{12} ! This ignores fraction rules and gives completely wrong results. Always find a common denominator first, then add only 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 can't I just add the top numbers and bottom numbers?

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Because fractions represent parts of a whole! Adding 14+18 \frac{1}{4} + \frac{1}{8} means combining different-sized pieces. You need the same-sized pieces (same denominator) before you can count how many you have total.

How do I know which denominator to use as the common one?

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Use the Least Common Multiple (LCM) of the denominators. For 4 and 8, since 8 is divisible by 4, the LCM is 8. This gives you the smallest possible common denominator!

What if I get confused about which fraction to convert?

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Convert the fraction with the smaller denominator to match the larger one. Here, convert 14 \frac{1}{4} to eighths since 8 is larger than 4.

Do I always multiply by 2 when converting fractions?

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No! You multiply by whatever number makes the denominators equal. From 4 to 8, multiply by 2. From 3 to 12, you'd multiply by 4. Always check: what × old denominator = new denominator?

How can I check if my answer is simplified?

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Look for common factors in the numerator and denominator. Since 3 and 8 share no common factors except 1, 38 \frac{3}{8} is already in simplest form!

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