直接写出得数0.25+0.5= 160÷2= 3.2+2.9= 30×80=2.4﹣0.8= 40×100= 366÷6= 30×45=200÷8= 810÷90= 24×5= 2020÷20=89÷3≈ 211÷7≈ 67×92≈ 51×29≈
5-3= 7-2= 9-1= 7-1= 8-5= 6-3=
6-5= 7-4= 7-6 = 10-8= 10-3= 5-3=
8-2= 8-6= 8-5= 8-3= 5-4= 5-1=
10-3= 10-2= 5-2= 7-3= 6-4= 8-4=
5-5= 6-1= 7-3= 8-5= 4-2= 9-7=