Fractions Math Example 5

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Example 5

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Add 23+34\frac{2}{3} + \frac{3}{4}.

Solution

  1. 1
    Find the least common denominator (LCD) of 33 and 44: LCD=12\text{LCD} = 12.
  2. 2
    Convert each fraction: 23=2ร—43ร—4=812\frac{2}{3} = \frac{2 \times 4}{3 \times 4} = \frac{8}{12} and 34=3ร—34ร—3=912\frac{3}{4} = \frac{3 \times 3}{4 \times 3} = \frac{9}{12}.
  3. 3
    Add the numerators: 812+912=1712\frac{8}{12} + \frac{9}{12} = \frac{17}{12}.
  4. 4
    Convert to a mixed number: 1712=1512\frac{17}{12} = 1\frac{5}{12}. Since gcdโก(5,12)=1\gcd(5, 12) = 1, this is already in simplest form.

Answer

1712=1512\frac{17}{12} = 1\frac{5}{12}
To add fractions with unlike denominators, first find the LCD and convert each fraction to an equivalent fraction with that denominator. Then add numerators and simplify.

About Fractions

A fraction is a number of the form ab\frac{a}{b} where aa (the numerator) counts how many equal parts you have and bb (the denominator, which must not be zero) tells how many equal parts the whole is divided into.

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