Solve Mixed Number Addition: 9½ + 2⅓

Mixed Number Addition with Unlike Denominators

912+213= 9\frac{1}{2}+2\frac{1}{3}=

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 First convert mixed fractions to improper fractions
00:44 Multiply each fraction by the second denominator to find the common denominator
00:57 Calculate the multiplications
01:14 Add with the common denominator
01:26 Now convert to a mixed fraction
01:32 Break down 71 into 66 plus 5
01:37 Break down the fraction into whole number and remainder
01:43 Convert from improper fraction to whole number and combine with mixed fraction
01:55 And this is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

912+213= 9\frac{1}{2}+2\frac{1}{3}=

2

Step-by-step solution

To solve 912+2139\frac{1}{2} + 2\frac{1}{3}, we will perform the following steps:

  • Convert each mixed number to an improper fraction.
  • Find a common denominator for these fractions.
  • Add the fractions together.
  • Convert the result back to a mixed number, if necessary.

Let's start by converting the mixed numbers:

9129\frac{1}{2} becomes 192 \frac{19}{2} because 9×2+1=199 \times 2 + 1 = 19.

2132\frac{1}{3} becomes 73 \frac{7}{3} because 2×3+1=72 \times 3 + 1 = 7.

Next, we find a common denominator for 192 \frac{19}{2} and 73 \frac{7}{3} . The common denominator of 2 and 3 is 6.

Convert 192 \frac{19}{2} to an equivalent fraction with a denominator of 6:

192=19×36=576 \frac{19}{2} = \frac{19 \times 3}{6} = \frac{57}{6} .

Convert 73 \frac{7}{3} to an equivalent fraction with a denominator of 6:

73=7×26=146 \frac{7}{3} = \frac{7 \times 2}{6} = \frac{14}{6} .

Add the fractions:

576+146=57+146=716 \frac{57}{6} + \frac{14}{6} = \frac{57 + 14}{6} = \frac{71}{6} .

Convert 716\frac{71}{6} back to a mixed number:

71÷6=1171 \div 6 = 11 with a remainder 55.

Therefore, 716=1156\frac{71}{6} = 11\frac{5}{6}.

Thus, the result of adding 912+2139\frac{1}{2} + 2\frac{1}{3} is 1156 \mathbf{11\frac{5}{6}} .

3

Final Answer

1156 11\frac{5}{6}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before adding
  • Technique: Find LCD of denominators: 2 and 3 gives LCD = 6
  • Check: Convert back to mixed number: 71÷6 = 11 remainder 5 = 1156 11\frac{5}{6}

Common Mistakes

Avoid these frequent errors
  • Adding whole numbers and fractions separately without finding common denominators
    Don't add 9+2=11 and then try to add 1/2+1/3 = 2/5! This gives 11 2/5 which is wrong because you can't add fractions with different denominators directly. Always convert to improper fractions first, find the LCD, then add.

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?

+

You can add whole numbers separately, but you still need a common denominator for the fractions! Without it, 12+13 \frac{1}{2} + \frac{1}{3} doesn't equal 25 \frac{2}{5} . Converting to improper fractions makes the process cleaner.

How do I convert a mixed number to an improper fraction?

+

Multiply the whole number by the denominator, then add the numerator. For 912 9\frac{1}{2} : (9×2) + 1 = 19, so you get 192 \frac{19}{2} .

What if I forget how to find the LCD?

+

For small numbers like 2 and 3, list multiples:

  • Multiples of 2: 2, 4, 6, 8, 10...
  • Multiples of 3: 3, 6, 9, 12...
The first number that appears in both lists is your LCD!

How do I convert an improper fraction back to a mixed number?

+

Divide the numerator by the denominator. For 716 \frac{71}{6} : 71 ÷ 6 = 11 remainder 5, so you get 1156 11\frac{5}{6} .

Can I solve this problem a different way?

+

Yes! You can add whole numbers first: 9 + 2 = 11, then add fractions: 12+13=36+26=56 \frac{1}{2} + \frac{1}{3} = \frac{3}{6} + \frac{2}{6} = \frac{5}{6} , giving 1156 11\frac{5}{6} . Both methods work!

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Mixed Fractions questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations