a) 1/2 *50 = 50/2 = 25, 1/2*100 = 100/2 = 50, 1/2*90 = 90/2 = 45,
1/2*40 =40/2 = 20, 1/2*800 = 800/2 = 400
b) 6:2 = 3, /:2 = 4, 88:2 = 44, 134:2 = 67
c) 20:4 = 5, 80:4 = 20, 100:4 = 25, 92:4 = 23
d) [tex] \frac{1}{4} [/tex]*16 = [tex] \frac{16}{4} [/tex] = 4
1/4*24 = 24/4 = 6
1/4*84 = 84/4 = 21
1/4*96 = 96/4 = 24