①200×5= ②100×28= ③60+50= ④80﹣40÷4=
⑤25×80= ⑥130×0= ⑦60÷5×2= ⑧32×597≈
⑨800÷80= ⑩400×18= ⑪90×60= ⑫40万﹣19万=
1.6+3.8= 0.5+0.9= 4.6+4.3= 2.9+6.1=
0.25+0.34= 0.36+0.45= 0.72+0.18= 0.59+0.41=
3.8-1.4= 0.9-0.5= 4.6-4.3= 6.1-2.9=
0.37+0.15= 0.95-0.36= 0.43-0.38= 0.51-0.41=
+136=701 -412=536
282+=781 569-=482