It is because 1/3 = (1*k)/(3*k) for any non-zero number k. When k = 5 you get 5/15.
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3/5-1/3... First make both fractions equal... 3/5 = 9/15 and 1/3 = 5/15. 9/15 - 5/15 = 4/15
3/45 is equal to 1/15
no, it is not 1/15 is the same as 3/45 ( multiply top(numerator) and bottom(denominator) of fraction both by 3)
9 over 15 is equal to 3 over 5.
42/3 - 14/5 = 43/15 or 213/15