a) 2,6 x 3,2 = 26/10 x 32/10 = 832/100 = 8,32
b) 8,23 x 0,4 = 823/100 x 4/10 = 3292/1000 = 3,292
c) 9,16 x 0,51 = 916/100 x 51/100 = 46716/10000 = 4,6716
d) 0,75 x 2,3 = 75/100 x 23/10 = 1725/1000 = 1,725
e) 0,25 x 5,24 = 25/100 x 524/100 = 13100/10000 = 131/100 = 1,31
f) 6,89 x 7,5 = 689/100 x 75/10 = 51675/1000 = 51,675
g) 5,4 x 2,3 = 54/10 x 23/10 = 1242/100 = 12,42
h) 1,75 x 2,004 = 175/100 x 2004/1000 = 350700/100000 = 3507/1000 = 3,507