估算.901×8≈ 98÷5≈ 509÷7≈ 989+605≈
算一算,填一填.0.9+0.6= 15.4+2.97= 5.94+10.7=10﹣3.14= 10.2﹣8.75= 11.65﹣7.39=
65.4﹣11.06+3.4920﹣﹣÷36×(+﹣)÷[(﹣)÷].
把苹果放在碗里.(连线)
计算.2.5+7.5= 9.8﹣0.8= 1.4+7.6=4.5+5.5= 19.8﹣9.8= 9.4+0.6=