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7 November, 22:15

How do you do a subtraction fraction

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Answers (2)
  1. 7 November, 22:45
    0
    divide top from bottom
  2. 7 November, 23:24
    0
    3/4-2/5=7/20

    Solution with Steps

    3/4-2/5=?

    The fractions have unlike denominators. First, find the Least Common Denominator and rewrite the fractions with the common denominator.

    LCD (3/4, 2/5) = 20

    Multiply both the numerator and denominator of each fraction by the number that makes its denominator equal the LCD. This is basically multiplying each fraction by 1.

    (3/4*5/5) - (2/5*4/4) = ?

    Complete the multiplication and the equation becomes

    15/20-8/20=?

    The two fractions now have like denominators so you can subtract the numerators.

    Then:

    15-8/20=7/20

    This fraction cannot be reduced.

    Therefore:

    3/4-2/5=7/20

    Solution by Formulas

    Apply the fractions formula for subtraction, to

    3/4-2/5

    and solve

    (3*5) - (2*4) / 4*5

    =15-8/20

    =7/20

    Therefore:

    3/4-2/5=7/20
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