1)
2)
3)
4)
1)4/5 * 1/5 = 4/25
2)35/13 * 13/10 =7*1/2=7/2
3)36/7 * 11/21= 12/7 * 11/7=132/49
4)17/15 :17/5 = 17/15 * 5/15 =1/3