1.

1) 2/9 * 27/28 = 1 * 3/14 = 1 * 3/14 = 3/14

2) 18 * 5/24 = 18/1 * 5/24 = 18*5/1*24 = 90/24 = 15/4

2.

1) 1/12 : 1/6 = 1/12 * 6/1 = 6/12 = 1/2

2) 5/6 : 15 = 5/6 * 1/15 = 1/6 * 1/3 = 1/18

3.

1) 1(1/3) * 3(3/8) = 4/3 * 27/8 = 1 * 9/2 = 9/2

2) 2(1/3) : 2(4/5) = 7/3 * 5/14 = 1/3 * 5/2 = 5/6