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Homework Help: Making a number into fraction

  1. Feb 15, 2010 #1
    1. The problem statement, all variables and given/known data

    If i have 1/2 + 1 = 1,5 (on the calculator), how do i make this into a fraction?

    I know this answer would be 1/2 + 1 = 3/2

    But how excactly is this done?


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 15, 2010 #2

    Mark44

    Staff: Mentor

    To add fractions, both fractions have to have the same denominator.

    For your problem, 1/2 + 1 = 1/2 + 2/2 = 3/2.

    Here's a slightly harder problem: 1/2 + 1/3

    The least common denominator is the least common multiple of 2 and 3, which is 6. So the common denominator will be 6. In a fraction, I can get the common denominator by multiplying by 1 in a suitable form. After the fractions have been rewritten using the common denominator, add the numerators and use the common denominator.

    [tex]\frac{1}{2} + \frac{1}{3} = \frac{1}{2} * \frac{3}{3} + \frac{1}{3} * \frac{2}{2}[/tex]
    [tex]=\frac{3}{6} + \frac{2}{6} = \frac{5}{6} [/tex]
     
  4. Feb 15, 2010 #3
    Thank you ! :)
     
  5. Feb 18, 2010 #4
    Well, you have one fraction (1/2) and a whole number 1 i.e. (2/2).
    To make this into one fraction you just have to add the numerators together because the denominator is the same on both sides, 1/2 + 2/2 = (1+2)/2 or 3/2. hope that helps.
     
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