Solve the Fraction Addition: 1/3 + 1/10 Step-by-Step

Fraction Addition with Unlike Denominators

13+110= \frac{1}{3}+\frac{1}{10}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 We want to find the least common denominator
00:06 Multiply each fraction by the other denominator to find the common denominator
00:09 Remember to multiply both numerator and denominator
00:21 Calculate the multiplications
00:29 Add under the common denominator
00:34 Calculate the numerator
00:37 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

13+110= \frac{1}{3}+\frac{1}{10}=

2

Step-by-step solution

To solve this problem, we will add the fractions 13 \frac{1}{3} and 110 \frac{1}{10} by finding a common denominator.

  • Step 1: Find a common denominator.
    Since the denominators are 3 and 10, the least common multiple (LCM) of these numbers is 30. Therefore, the common denominator will be 30.
  • Step 2: Convert each fraction to have the common denominator.
    Convert 13 \frac{1}{3} into an equivalent fraction with a denominator of 30:
    13=1×103×10=1030 \frac{1}{3} = \frac{1 \times 10}{3 \times 10} = \frac{10}{30} .
    Convert 110 \frac{1}{10} into an equivalent fraction with a denominator of 30:
    110=1×310×3=330 \frac{1}{10} = \frac{1 \times 3}{10 \times 3} = \frac{3}{30} .
  • Step 3: Add the equivalent fractions.
    Now that both fractions have the same denominator, add the numerators while keeping the denominator 30:
    1030+330=10+330=1330 \frac{10}{30} + \frac{3}{30} = \frac{10 + 3}{30} = \frac{13}{30} .

After calculating, we find that the sum of the fractions is 1330\frac{13}{30}.

Therefore, the correct answer to the problem is 1330 \frac{13}{30} .

3

Final Answer

1330 \frac{13}{30}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Find common denominator before adding fractions with different denominators
  • Technique: Convert 13 \frac{1}{3} to 1030 \frac{10}{30} and 110 \frac{1}{10} to 330 \frac{3}{30}
  • Check: Verify 1030+330=1330 \frac{10}{30} + \frac{3}{30} = \frac{13}{30} by adding numerators only ✓

Common Mistakes

Avoid these frequent errors
  • Adding numerators and denominators separately
    Don't add 13+110 \frac{1}{3} + \frac{1}{10} as 1+13+10=213 \frac{1+1}{3+10} = \frac{2}{13} ! This completely ignores fraction rules and gives a wrong answer. Always find the common denominator first, then add only the numerators.

Practice Quiz

Test your knowledge with interactive questions

Complete the following exercise:

\( \frac{3}{4}:\frac{5}{6}=\text{?} \)

FAQ

Everything you need to know about this question

How do I find the least common multiple of 3 and 10?

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List the multiples of each number: 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30... 10: 10, 20, 30... The first number that appears in both lists is 30, so that's your LCM!

Why can't I just add 1/3 + 1/10 directly?

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You can only add fractions when they have the same denominator. Think of it like adding apples and oranges - you need to convert them to the same unit first!

Do I always need to find the LCM, or can I use any common multiple?

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You can use any common multiple, but the LCM makes calculations easier. For example, 60 works too: 2060+660=2660 \frac{20}{60} + \frac{6}{60} = \frac{26}{60} , but then you'd need to simplify to 1330 \frac{13}{30} .

How do I know if my final answer can be simplified?

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Check if the numerator and denominator share any common factors. Since 13 is prime and doesn't divide 30, 1330 \frac{13}{30} is already in simplest form!

What if I get confused about which number to multiply by?

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Remember: multiply both numerator and denominator by the same number. For 13 \frac{1}{3} , multiply by 10 to get 30 in the denominator: 1×103×10=1030 \frac{1 \times 10}{3 \times 10} = \frac{10}{30} .

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