300×6=1800, 300÷6=50, 137-19=118, 309÷3=103,
280÷7=40, 0÷60=0, 20×0=0, 55÷5=11,
240÷3=80, 805÷9≈90, 440÷9≈50, 359÷6≈60,
480÷4×2=240, 16×0×80=0.
300×6=1800, 300÷6=50, 137-19=118, 309÷3=103,
280÷7=40, 0÷60=0, 20×0=0, 55÷5=11,
240÷3=80, 805÷9≈90, 440÷9≈50, 359÷6≈60,
480÷4×2=240, 16×0×80=0.