Algebra: Finding Common Denominators
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Questions and Answers

What is the first step in adding the fractions $\frac{20}{50}$ and $\frac{1}{6}$?

  • Converting $\frac{1}{6}$ to a decimal
  • Multiplying the fractions together
  • Finding a common denominator (correct)
  • Simplifying $\frac{20}{50}$ to $\frac{2}{5}$
  • What is the sum of the fractions $\frac{20}{50}$ and $\frac{1}{6}$ after finding a common denominator?

  • $\frac{7}{15}$
  • $\frac{19}{30}$
  • $\frac{4}{10}$
  • $\frac{31}{75}$ (correct)
  • What is the simplified form of $\frac{20}{50}$ before adding it to $\frac{1}{6}$?

  • $\frac{4}{10}$
  • $\frac{10}{25}$
  • $\frac{1}{2}$ (correct)
  • $\frac{2}{5}$
  • If you convert $\frac{1}{6}$ to an equivalent fraction with a denominator of 75, what will it be?

    <p>$\frac{13}{75}$</p> Signup and view all the answers

    Which operation is used to combine $\frac{20}{50}$ and $\frac{1}{6}$ after converting to a common denominator?

    <p>Addition</p> Signup and view all the answers

    Study Notes

    Calculation of the Sum

    • To calculate the sum 20/50 + 1/6, we first need to find a common denominator for the two fractions.

    Finding the Common Denominator

    • The denominators are 50 and 6.
    • We need to find the least common multiple (LCM) of 50 and 6.
    • The prime factorization of 50 is 2 x 5 x 5.
    • The prime factorization of 6 is 2 x 3.
    • The LCM of 50 and 6 is found by taking the highest power of each prime factor that appears in either factorization: 2 x 3 x 5 x 5 = 150.

    Converting Fractions to Equivalent Fractions with the Common Denominator

    • We need to convert both fractions to equivalent fractions with a denominator of 150 to add them.

    • For the first fraction (20/50):

      • We need to multiply both the numerator and denominator by 3 to get an equivalent fraction with a denominator of 150. 3 x 20 / 3 x 50 = 60/150
    • For the second fraction (1/6):

      • We need to multiply both the numerator and denominator by 25 to get an equivalent fraction with a denominator of 150. 25 x 1/ 25 x 6 = 25/150

    Addition of the Equivalent Fractions

    • Now that both fractions have the same denominator, we can add the numerators: 60/150 + 25/150 = (60 + 25)/150 = 85/150

    Simplifying the Result

    • The fraction 85/150 can be simplified by dividing both the numerator and denominator by their greatest common divisor (GCD), which is 5. 85 / 5 = 17 150 / 5 = 30

    • The simplified fraction is 17/30.

    Final Answer

    • The final answer is 17/30.

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    Description

    This quiz focuses on the calculation of the sum of fractions, specifically through the process of finding a common denominator. You will apply methods such as determining the least common multiple and converting fractions to equivalent fractions. Test your skills in fraction addition!

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