Solve the Fraction Addition: 2/6 + 5/12 Step-by-Step

Fraction Addition with Common Denominator Method

26+512= \frac{2}{6}+\frac{5}{12}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 We want to find the least common denominator
00:06 Therefore we'll multiply by 2, to get the common denominator 12
00:09 Remember to multiply both numerator and denominator
00:15 Let's calculate the multiplications
00:24 Add under the common denominator
00:28 Calculate the numerator
00:31 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

26+512= \frac{2}{6}+\frac{5}{12}=

2

Step-by-step solution

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

  • Step 1: Identify the least common denominator (LCD) for the given fractions.
  • Step 2: Convert each fraction to an equivalent fraction with this common denominator.
  • Step 3: Add the numerators, keeping the denominator unchanged.
  • Step 4: Simplify the resultant fraction if possible.

Now, let's work through each step:

Step 1: Identify the least common denominator (LCD).
The denominators are 6 and 12. The smallest number that both 6 and 12 divide evenly into is 12. Therefore, the LCD is 12.

Step 2: Convert the fractions to have the LCD as their denominator.
26\frac{2}{6} needs to be converted to a fraction with a denominator of 12. We multiply both the numerator and denominator by 2:

2×26×2=412\frac{2 \times 2}{6 \times 2} = \frac{4}{12}.

The second fraction, 512\frac{5}{12}, already has the denominator of 12, so it remains 512\frac{5}{12}.

Step 3: Add the two fractions:
412+512=4+512=912\frac{4}{12} + \frac{5}{12} = \frac{4 + 5}{12} = \frac{9}{12}.

Step 4: Simplify the fraction.
The fraction 912\frac{9}{12} can be simplified by dividing both the numerator and the denominator by their greatest common divisor, which is 3:

9÷312÷3=34\frac{9 \div 3}{12 \div 3} = \frac{3}{4}.

Therefore, after fully simplifying, the sum of the fractions is 34 \frac{3}{4} .

3

Final Answer

912 \frac{9}{12}

Key Points to Remember

Essential concepts to master this topic
  • LCD Rule: Find smallest number both denominators divide into evenly
  • Technique: Convert 26 \frac{2}{6} to 412 \frac{4}{12} by multiplying by 2
  • Check: Verify 412+512=912=34 \frac{4}{12} + \frac{5}{12} = \frac{9}{12} = \frac{3}{4}

Common Mistakes

Avoid these frequent errors
  • Adding denominators instead of finding common denominator
    Don't add 26+512=718 \frac{2}{6} + \frac{5}{12} = \frac{7}{18} ! This gives completely wrong results because you can't add fractions with different denominators directly. Always find the LCD first, then convert both fractions.

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 numerators and denominators separately?

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Because fractions represent parts of different wholes! Adding 26+512 \frac{2}{6} + \frac{5}{12} directly is like adding 2 slices of a 6-piece pizza to 5 slices of a 12-piece pizza - the pieces are different sizes!

How do I find the LCD when the denominators are different?

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List the multiples of each denominator and find the smallest common one. For 6 and 12: multiples of 6 are 6, 12, 18... and multiples of 12 are 12, 24... So LCD is 12!

Do I always need to simplify my final answer?

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Yes, always simplify! 912 \frac{9}{12} and 34 \frac{3}{4} are equal, but 34 \frac{3}{4} is the simplest form because 3 and 4 have no common factors besides 1.

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

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Great! That makes your job easier. Like in this problem, 512 \frac{5}{12} already has denominator 12, so you only need to convert 26 \frac{2}{6} to 412 \frac{4}{12} .

How do I check if my LCD is correct?

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Your LCD should be the smallest number that both original denominators divide into evenly. Test: 12 ÷ 6 = 2 ✓ and 12 ÷ 12 = 1 ✓, so 12 works perfectly!

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