Solve the Fraction Addition: 1/6 + 1/3 + 2/12 Step-by-Step

Fraction Addition with Mixed Denominators

Solve the following exercise:

16+13+212=? \frac{1}{6}+\frac{1}{3}+\frac{2}{12}=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:06 Let's solve this problem together.
00:09 First, we need to find the least common denominator.
00:13 We'll multiply by two and four to get a common denominator of twelve.
00:19 Remember, multiply both the top and bottom numbers.
00:33 Now, let's do those multiplications.
00:47 Add everything under the common denominator.
00:54 Calculate the top number to finish.
00:57 And that's how we solve this question!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following exercise:

16+13+212=? \frac{1}{6}+\frac{1}{3}+\frac{2}{12}=\text{?}

2

Step-by-step solution

We will add the fractions 16 \frac{1}{6} , 13 \frac{1}{3} , and 212 \frac{2}{12} by first finding the common denominator.

The least common denominator (LCD) of the denominators 6, 3, and 12 is 12.

Let's convert each fraction to have this common denominator:

  • Convert 16 \frac{1}{6} : Multiply both the numerator and the denominator by 2: 1262=212 \frac{1 \cdot 2}{6 \cdot 2} = \frac{2}{12} .
  • Convert 13 \frac{1}{3} : Multiply both the numerator and the denominator by 4: 1434=412 \frac{1 \cdot 4}{3 \cdot 4} = \frac{4}{12} .
  • 212 \frac{2}{12} already has the denominator 12.

Now add the fractions:

212+412+212=2+4+212=812 \frac{2}{12} + \frac{4}{12} + \frac{2}{12} = \frac{2 + 4 + 2}{12} = \frac{8}{12} .

The fraction 812 \frac{8}{12} can be simplified, but since the problem specifies to provide the answer in this form, we leave it as is.

Therefore, the solution to the problem is 812 \frac{8}{12} .

3

Final Answer

812 \frac{8}{12}

Key Points to Remember

Essential concepts to master this topic
  • LCD Rule: Find the least common denominator before adding fractions
  • Technique: Convert 13 \frac{1}{3} to 412 \frac{4}{12} by multiplying by 44 \frac{4}{4}
  • Check: Verify LCD is correct: 12 divides by 6, 3, and 12 ✓

Common Mistakes

Avoid these frequent errors
  • Adding numerators and denominators separately
    Don't add 16+13=29 \frac{1}{6} + \frac{1}{3} = \frac{2}{9} by adding 1+1=2 and 6+3=9! This completely ignores fraction rules and gives wrong answers. Always find the LCD first, then convert all fractions to equivalent fractions with that denominator.

Practice Quiz

Test your knowledge with interactive questions

\( \frac{2}{4}+\frac{1}{4}= \)\( \)

FAQ

Everything you need to know about this question

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

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Because fractions represent parts of different wholes! Adding 16+13 \frac{1}{6} + \frac{1}{3} directly would be like adding 1 slice of a 6-piece pizza to 1 slice of a 3-piece pizza - you need the same size pieces first.

How do I find the LCD of 6, 3, and 12?

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List multiples of the largest number (12): 12, 24, 36... Check if smaller numbers divide evenly: 6 goes into 12 (yes!), 3 goes into 12 (yes!). So LCD = 12.

Do I always need to simplify my final answer?

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Not always! In this problem, the answer choices are given as twelfths, so 812 \frac{8}{12} is the expected format. Always match the format requested in the problem.

What if one fraction already has the LCD as its denominator?

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Lucky you! Like 212 \frac{2}{12} in this problem - it stays exactly the same. Only convert the fractions that need converting.

Can I convert to a different common denominator instead of the LCD?

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Yes, but it makes more work! You could use 24 instead of 12, but you'd get 1624 \frac{16}{24} instead of 812 \frac{8}{12} . The LCD gives the simplest calculation.

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