1.2﹣ =
÷ =
×2.7=
1 ﹣0.8=
40×25%=
498+605≈
3.3+2=
1.6×5=
36.6÷6=
631÷72≈
15×60= 640÷40= ÷ = 398÷202≈ 6.9÷0.1=
1.05-0.65= 0.8×125%= 5- = ÷6= 910-430=