Solve Mixed Number Addition: 2⅗ + 4⅙ Step-by-Step

Mixed Number Addition with Unlike Denominators

235+416= 2\frac{3}{5}+4\frac{1}{6}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 First, let's convert mixed fractions to fractions
00:52 Multiply each fraction by the second denominator to find the common denominator
01:01 Calculate the multiplications
01:15 Add with the common denominator
01:23 Now let's convert to a mixed fraction
01:29 Break down 203 into 180 plus 23
01:44 Break down the fraction into whole number and remainder
01:52 Convert proper fraction to whole number and combine with mixed fraction
02:02 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

235+416= 2\frac{3}{5}+4\frac{1}{6}=

2

Step-by-step solution

To solve the addition of these mixed numbers, we'll follow these steps:

  • Step 1: Convert each mixed number to an improper fraction.
  • Step 2: Find a common denominator and add the fractions.
  • Step 3: Convert the resulting improper fraction back to a mixed number.

Now, let's work through each step:

Step 1: Convert the mixed numbers:
For 235 2\frac{3}{5} , convert to an improper fraction: 2×5+3=10+3=13 2 \times 5 + 3 = 10 + 3 = 13 , so 235=135 2\frac{3}{5} = \frac{13}{5} .
For 416 4\frac{1}{6} , convert to an improper fraction: 4×6+1=24+1=25 4 \times 6 + 1 = 24 + 1 = 25 , so 416=256 4\frac{1}{6} = \frac{25}{6} .

Step 2: Addition of the fractions:
The denominators are 5 and 6. The least common denominator (LCD) is 30 30 .
Convert 135 \frac{13}{5} to 13×65×6=7830 \frac{13 \times 6}{5 \times 6} = \frac{78}{30} .
Convert 256 \frac{25}{6} to 25×56×5=12530 \frac{25 \times 5}{6 \times 5} = \frac{125}{30} .
Now add: 7830+12530=78+12530=20330 \frac{78}{30} + \frac{125}{30} = \frac{78 + 125}{30} = \frac{203}{30} .

Step 3: Convert 20330 \frac{203}{30} back to a mixed number:
Divide 203 by 30: The quotient is 6 and the remainder is 23.
Thus, 20330=62330 \frac{203}{30} = 6\frac{23}{30} .

Therefore, the solution to the problem is 62330 6\frac{23}{30} , which matches choice 3.

3

Final Answer

62330 6\frac{23}{30}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before adding
  • Technique: Find LCD of denominators 5 and 6 equals 30
  • Check: Convert answer back: 20330=62330 \frac{203}{30} = 6\frac{23}{30}

Common Mistakes

Avoid these frequent errors
  • Adding whole numbers and fractions separately without finding common denominator
    Don't just add 2+4=6 and then try to add 35+16 \frac{3}{5}+\frac{1}{6} directly = wrong fraction part! This ignores the different denominators and gives incorrect results. Always convert to improper fractions first, then find the LCD to add properly.

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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While you can add whole numbers separately, you must still find a common denominator for the fraction parts. The method shown (converting to improper fractions) is more reliable and prevents errors.

How do I find the LCD of 5 and 6?

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List multiples of each number: 5 (5, 10, 15, 20, 25, 30...) and 6 (6, 12, 18, 24, 30...). The first number that appears in both lists is your LCD!

What if my final fraction can be simplified?

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Always check if your answer can be reduced! In this case, 2330 \frac{23}{30} cannot be simplified because 23 and 30 share no common factors except 1.

Is there a faster way to convert mixed numbers?

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Yes! Use the formula: improper fraction = (whole × denominator) + numerator. For 235 2\frac{3}{5} : (2×5)+3 = 13, so it becomes 135 \frac{13}{5} .

How do I know when to convert back to a mixed number?

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Convert back when your improper fraction's numerator is larger than its denominator. Divide: 203÷30 = 6 remainder 23, giving 62330 6\frac{23}{30} .

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