1) List all the multiples of each denominator and find the first common multiple:
9 = 9
3 = 3, 6, 9
So the LCD is 9
2) Make the denominators the same as the LCD:
7/9 - 2x3/3x3
3) Simplify. The denominators are now the same:
7/9 - 6/9
4) Join the denominators:
7-6/9
5) Simplify:
1/9
(Decimal form: 0.111111
