Solve Fraction Addition: 2/3 + 1/9 Step-by-Step

Fraction Addition with Different Denominators

23+19= \frac{2}{3}+\frac{1}{9}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:03 Let's solve the problem together.
00:06 First, we need to find the least common denominator.
00:10 We'll multiply by three to make the denominator nine.
00:14 Remember, multiply both the top and bottom numbers.
00:18 Now, let's do the calculations.
00:23 Next, add with the same denominator.
00:30 Let's calculate the top number or numerator.
00:34 And that's how we find the answer!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

23+19= \frac{2}{3}+\frac{1}{9}=

2

Step-by-step solution

To solve the problem of adding 23 \frac{2}{3} and 19 \frac{1}{9} , we follow these steps:

  • Step 1: Find a common denominator.
    The denominators are 3 and 9. Since 9 is a multiple of 3, we can use 9 as the common denominator.
  • Step 2: Convert the fractions to have the common denominator.
    - To convert 23 \frac{2}{3} to have a denominator of 9, multiply both the numerator and denominator by 3: 23=2×33×3=69 \frac{2}{3} = \frac{2 \times 3}{3 \times 3} = \frac{6}{9}
  • Step 3: Add the fractions 69\frac{6}{9} and 19\frac{1}{9}.
    69+19=6+19=79 \frac{6}{9} + \frac{1}{9} = \frac{6+1}{9} = \frac{7}{9}
  • Step 4: Simplify the result, if necessary.
    The fraction 79\frac{7}{9} is already in its simplest form.

Therefore, the solution to 23+19\frac{2}{3} + \frac{1}{9} is 79\frac{7}{9}.

3

Final Answer

79 \frac{7}{9}

Key Points to Remember

Essential concepts to master this topic
  • Common Denominator: Find LCD before adding fractions with different denominators
  • Conversion: Transform 23 \frac{2}{3} to 69 \frac{6}{9} by multiplying by 3
  • Check: Verify 69+19=79 \frac{6}{9} + \frac{1}{9} = \frac{7}{9} is in simplest form ✓

Common Mistakes

Avoid these frequent errors
  • Adding numerators and denominators separately
    Don't add 2 + 1 = 3 and 3 + 9 = 12 to get 312 \frac{3}{12} ! This ignores that fractions represent division, not separate numbers. Always find a common denominator first, then add only the numerators.

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 directly?

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Because fractions represent division, not separate numbers! 23 \frac{2}{3} means "2 divided by 3", so you need equal-sized pieces (same denominator) before adding.

How do I know if 9 is the right common denominator?

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Since 9 is a multiple of 3 (3 × 3 = 9), it works perfectly! The LCD is the smallest number that both denominators divide into evenly.

Do I always multiply by the larger denominator?

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Not always! For 14+16 \frac{1}{4} + \frac{1}{6} , you'd need 12 as the LCD, not 6. Find the least common multiple of both denominators.

How can I check if my answer is in simplest form?

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Look for common factors in the numerator and denominator. Since 7 and 9 share no common factors other than 1, 79 \frac{7}{9} is already simplified!

What if the fractions already have the same denominator?

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Lucky you! Just add the numerators and keep the same denominator. For example: 38+58=88=1 \frac{3}{8} + \frac{5}{8} = \frac{8}{8} = 1

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