1) 4/5; 1/40

2) 6 1/4; 19/5; 3 10/11; 25/9

3) 1/8; 3/4; 5/6; 1 1/6; 7/4; 2 3/8

4) 8/9 * 2 3/4 = 8/9 * 11/4 = 88/36 = 44/13 = 3 5/13

5) 4 4/5 * (2 1/16 - 5/16 * 4/15)

2 1/16 - 5/16 * 4/15 = 33/16 - 5*4/16*15 = 495-20/240 = 475/240 = 1 235/240 = 1 47/48

4 4/5 * 47/48 = 24*47/5*48 = 1*47/5*2 = 47/10 = 4 7/10 = 4,7