Question

What step do I do first

Answer 1

First, find the lowest common denominator, or LCD;
Here, the lowest common denominator is 24;

`3 (3)/(8) -1 (7)/(12) \\ (3)/(3) ( (27)/(8)) - ( (2)/(2) )(19)/(12) \\ (3*27)/(3*8) - (2*19)/(2*12)\\ (81)/(24) - (38)/(24) \\ 24*( (81-38)/(24) )\\ 81-38\\ 43`

Answer 2

1st you change them to improper, 2nd you make the denominators match by multiplying and 3rd you subtract! I hope this helped!!