÷2= 0×199= 302+197≈ × =
1-0.05= 6.3÷10%= 489÷71≈ + =
①2.8× ÷
②( + )×30
③7.42-5.87+2.58-4.13
④0.25×4.4
⑤25×32×125
⑥ ×[ -( -0.125)]