Solve Mixed Number Addition: 6⁴/₆ + 2¹/₅

Mixed Number Addition with Different Denominators

646+215= 6\frac{4}{6}+2\frac{1}{5}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 Let's solve the problem together.
00:08 First, let's convert mixed fractions into simple fractions.
00:52 Next, multiply each fraction by the second denominator to find a common denominator.
01:03 Now calculate these products.
01:15 And add them using the common denominator.
01:22 Now, let's convert back to a mixed fraction.
01:29 To simplify, break down two hundred sixty-six into two hundred forty plus twenty-six.
01:41 Break the fraction into a whole number and a remainder.
01:48 Convert the proper fraction into a whole number. Combine it with the mixed fraction.
01:56 And that's how we solve the problem!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

646+215= 6\frac{4}{6}+2\frac{1}{5}=

2

Step-by-step solution

To solve 646+2156\frac{4}{6} + 2\frac{1}{5}, follow these steps:

  • Step 1: Convert the mixed numbers to improper fractions.

646=6×6+46=4066\frac{4}{6} = \frac{6 \times 6 + 4}{6} = \frac{40}{6} and 215=2×5+15=1152\frac{1}{5} = \frac{2 \times 5 + 1}{5} = \frac{11}{5}.

  • Step 2: Find a common denominator for the fractions 406\frac{40}{6} and 115\frac{11}{5}.

The least common denominator of 6 and 5 is 30.

Convert 406\frac{40}{6} to have the denominator 30: 40×56×5=20030 \frac{40 \times 5}{6 \times 5} = \frac{200}{30} .

Convert 115\frac{11}{5} to have the denominator 30: 11×65×6=6630 \frac{11 \times 6}{5 \times 6} = \frac{66}{30} .

  • Step 3: Add the fractions with the common denominator.

20030+6630=200+6630=26630\frac{200}{30} + \frac{66}{30} = \frac{200 + 66}{30} = \frac{266}{30}.

  • Step 4: Convert the improper fraction 26630\frac{266}{30} back to a mixed number.

Divide 266 by 30, quotient is 8 and remainder is 26: 26630=82630\frac{266}{30} = 8\frac{26}{30}.

Therefore, the solution to the problem is 826308\frac{26}{30}.

3

Final Answer

82630 8\frac{26}{30}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before adding
  • Technique: Find LCD of 6 and 5 is 30, convert both fractions
  • Check: Convert final answer back to mixed number: 266÷30 = 8²⁶⁄₃₀ ✓

Common Mistakes

Avoid these frequent errors
  • Adding whole numbers and fractions separately without common denominators
    Don't add 6+2=8 then try ⁴⁄₆ + ¹⁄₅ without finding LCD = wrong answer like 8⁹⁄₁₁! This ignores that fractions need same denominators to add. Always convert to improper fractions first, then find common denominator for all parts.

Practice Quiz

Test your knowledge with interactive questions

\( 5:\frac{2}{5}= \)

FAQ

Everything you need to know about this question

Why can't I just add the whole numbers and fractions separately?

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You could add whole numbers separately (6+2=8), but you still need to find a common denominator for the fraction parts. Converting to improper fractions first is often easier and less error-prone!

How do I find the LCD of 6 and 5?

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Since 6 and 5 share no common factors (they're relatively prime), their LCD is simply 6×5=30 6 \times 5 = 30 . Always check if numbers have common factors first!

Do I need to simplify the final answer?

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The answer 82630 8\frac{26}{30} can be simplified! Both 26 and 30 are divisible by 2, giving us 81315 8\frac{13}{15} . Always check if your fraction can be reduced to lowest terms.

What if I make a mistake converting to improper fractions?

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Double-check: 646=(6×6)+46=406 6\frac{4}{6} = \frac{(6 \times 6) + 4}{6} = \frac{40}{6} . The formula is whole × denominator + numerator over the original denominator.

Is there an easier way to do this problem?

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You could add whole numbers first: 6+2=8, then add fractions: 46+15=2030+630=2630 \frac{4}{6} + \frac{1}{5} = \frac{20}{30} + \frac{6}{30} = \frac{26}{30} , giving 82630 8\frac{26}{30} . Both methods work!

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