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19 June, 00:09

Find the sum - 3/5+4/9

Answer with supporting work

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Answers (2)
  1. 19 June, 01:52
    0
    Ok so to find the answer to this you have to make both fractions have the same denominator.

    To find the LCD (Least common denominator) follow these steps:

    *Think: what number can be divided by both 9 and 5?

    The answer is: 45 (shortcut way is to multiply both denominators by each other ie: 9 x 5)

    Now make the numerators match:

    For - 3/5, the denominator (5) is multiplied by 9 to get 45, so the numerator (-3) has to also be multiplied by 9.

    You get: - 27/45

    For 4/9, the denominator (9) is multiplied by 5 to get 45, so the numerator (4) has to also be multiplied by 5.

    You get: 20/45

    Now the problem looks like this:

    -27/45 + 20/45

    **Be sure to remember there is a negative sign!

    Now we just add the numerators:

    -27 + 20 = - 7

    (If you have trouble doing that remember that you can just subtract the positive number from the negative ie: 27-20 and then just re-add the negative sign)

    Then just re-add the denominator:

    -7/45

    This cannot be simplified so this is the final answer!
  2. 19 June, 02:48
    0
    The correct answer is 1.044
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