Whats 126/399 in its simplest form

A common factor of both 126 and 399 is 3 so we can divide both numbers by 3.

126 / 3 = 42

399 / 3 = 133

A common factor for both 42 and 133 is 7 so we can divide both numbers by 7.

42 / 7 = 6

133 / 7 = 19

19 is a prime number so we can't reduce it anymore, therefore 126/399 in its simplest form is 6/19