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Anonymous
Anonymous asked in Science & MathematicsMathematics · 9 years ago

how do you solve 1/2+8/9-20/30?

6 Answers

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  • Sun
    Lv 7
    9 years ago
    Favorite Answer

    1/2+8/9-20/30,

    20/30=2/3,

    1/2+8/9-2/3,

    9/18+16/18-12/18,

    9+16-12=13,

    13/18.

    Answer: 13/18.

  • 9 years ago

    to solve this you need to make the denominators the same.

    we can make all of the denominators 18.

    so 1/2 * 9/9 = 9/18

    8/9 * 2/2 = 16/18

    20/30 is the same as 2/3

    so 2/3 * 6/6 = 12/18

    that gives us 9/18+16/18-12/18

    25/18-12/18

    13/18

    1/2+8/9-20/30=13/18

  • Anonymous
    9 years ago

    First, you have to find a common denominator of all three fractions in the equation.

    Then, set all the denominators equal to a common denominator (18).

    The common denominator was 18 because you could reduce 20/30 to 2/3.

    After that, the equation would be changed to 9/18+16/18-12/18.

    Then, you would get the answer of 13/18

    : )

    Source(s): Algebra 1 student
  • 9 years ago

    take all the denominators to their least common multiple, in this case...there is 2, a 9 and a 30 in denominators respectively.. therefore its being 270 their least common multiple(L.C.M.)...

    then multiply the numerators of each term by the number which u use to multiply the denominator to take it to its L.C.M. For an e.g. to make denominator of the first term 270, u shud multiply it by 135..multiply the numerator too by 135. that give u 135/270, similarly multiplying boy numerator and denominator by 30 in the second term gives 240/270 and the third term gives 180/270.

    then use the BODMAS method, so first add the terms which u need to add that is 135/270+240/270..that gives u 375/270...then substract..375/270 - 180/270 = 195/270...well well seems we can still simplify it...13/18 ...k thats it

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  • 9 years ago

    by using "BODMAS"

    1 - Brackets

    2 - Powers

    3 - Divisions

    4 - Multiplication

    5 - Addition

    6 - Subtraction.

    so you do (1/2) + (8/9) - (20/30)

  • Mike G
    Lv 7
    9 years ago

    1/2+8/9-2/3 =

    [27/54+48/54-36]/54=

    39/54 = 13/18

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