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

Fraction Addition with Different Denominators

Solve the following equation:

13+29= \frac{1}{3}+\frac{2}{9}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 Let's solve this math problem together.
00:08 First, we'll multiply the fraction by 3. This helps us find a common denominator.
00:14 Remember! Multiply both the top number, the numerator, and the bottom number, the denominator.
00:20 Next, calculate the products of both.
00:24 Now, add the fractions. Make sure they have the same denominator.
00:28 Let's calculate the new numerator.
00:31 And now we have the solution to our question ready.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following equation:

13+29= \frac{1}{3}+\frac{2}{9}=

2

Step-by-step solution

We must first identify the lowest common denominator between 3 and 9.

In order to determine the lowest common denominator, we need to find a number that is divisible by both 3 and 9.

In this case, the common denominator is 9.

We will then proceed to multiply each fraction by the appropriate number to reach the denominator 9.

We'll multiply the first fraction by 3

We'll multiply the second fraction by 1

1×33×3+2×19×1=29+29 \frac{1\times3}{3\times3}+\frac{2\times1}{9\times1}=\frac{2}{9}+\frac{2}{9}

Finally we'll combine and obtain the following:

2+39=59 \frac{2+3}{9}=\frac{5}{9}

3

Final Answer

59 \frac{5}{9}

Key Points to Remember

Essential concepts to master this topic
  • LCD Rule: Find the least common denominator before adding fractions
  • Technique: Convert 13 \frac{1}{3} to 39 \frac{3}{9} using equivalent fractions
  • Check: Verify 39+29=59 \frac{3}{9} + \frac{2}{9} = \frac{5}{9} by adding numerators ✓

Common Mistakes

Avoid these frequent errors
  • Adding numerators and denominators separately
    Don't add 1+2=3 and 3+9=12 to get 3/12! This ignores the need for common denominators and gives wrong results. Always find the LCD first, then convert both fractions before adding only the numerators.

Practice Quiz

Test your knowledge with interactive questions

Without calculating, determine whether the quotient in the division exercise is less than 1 or not:

\( 5:6= \)

FAQ

Everything you need to know about this question

Why can't I just add 1/3 + 2/9 directly?

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You can only add fractions when they have the same denominator. Think of it like adding different sized pieces - you need equal-sized pieces first! Convert to common denominators, then add.

How do I find the LCD of 3 and 9?

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Since 9 is a multiple of 3 (3 × 3 = 9), the LCD is simply 9. List multiples: 3 has multiples 3, 6, 9... and 9 has multiples 9, 18, 27... The smallest common one is 9.

What does 'equivalent fractions' mean?

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Equivalent fractions represent the same value but look different. 13 \frac{1}{3} equals 39 \frac{3}{9} because we multiply both top and bottom by 3. They're the same size piece!

Do I always need to simplify my final answer?

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Yes, always simplify! Check if the numerator and denominator share common factors. In this case, 59 \frac{5}{9} is already in lowest terms since 5 and 9 share no common factors.

What if I get a different LCD than 9?

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For 3 and 9, the LCD is definitely 9. But you could use 18 or 27 - you'd just have extra work simplifying! Always use the smallest common denominator to make calculations easier.

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