1/5 =. 3/ 15 because you are multiplying the numerator by 3 so the denominator has to be multiplied by 3 as well
7/8 =. 14/16 because you are multiplying the numerator by 2 the denominator has to be multiplied by 2 as well
1/6. =. 2/12 because you are multiplying the numerator by 2