800 entre 20
1.95 + 0 .05 =
30 x 400
10 x 5 + 8 - 8 =
15 - 9 -5
1/2 x1/4
.30 + .45 =
3.95 x 10
.98 x 10
2750 - 750
.75
2000
12 000
9.8
6/8 o 3/4
50
2
40
39.5
1
