50×8=
87+123=
78÷6=
632÷70≈
360÷90=
80×25=
680÷40=
103×19≈
540÷9=
40×21=
0×9=
150×4=
11×50=
480÷4=
540÷6=
57÷3=
9×9-1=80,98×9-2=880,987×9-3=8880,×9-=8888880
7540000= 20800000= 280000=
530000= 40300000= 2100000=