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90/270 = (90*1)/(90*3) = 1/3
No, 30 over 90 = 1 over 3, 1 over 10 cannot be simplified any further
15/90 = 3/18 = 1/6
Prime factorisation of 18 = 2*3*3 Prime factorisation of 30 = 2*3*5 Then 1/18 = 5*1/5*18 = 5*90 (using the prime factor of 30 that is not in 18) and 1/30 = 3*1/3*30 = 3*90 (using the extra prime factor of 18 that is not in 30) So 1/18 + 1/30 = 5/90 + 3/90 = 8/90 = 4/45
1 over 3, 2 over 6, 4 over 12, and 30 over 90.