7/2 - 3/9
First note that 3/9 = 1/3 so
7/2 - 3/9
= 7/2 - 1/3
Find equivalent fractions with lcd, which is 6. To make the first fraction to have denominator of 6, we multiply it by 3 both on top and bottom. For the second fraction, we multiply by 2 on both top and bottom. So,
= 7(3) / 2(3) - 1(2) / 3(2)
= 21/6 - 2/6
= 19/6
or if you have to write in mixed number,
= 3 1/6