645cm6.45m 1.372 1.72
1.02+0.8= 7+2.3= 3.2-0.2= 0.87-0.7=
8.25+1.75= 10-0.5= 13.5-1.3= 5.2-4=
25×40= 0÷6= 300÷6 = 45×2=
①33.7-(27.9+3.7)
②8400÷8-23×40
③213×[(22+59)÷9]
④125×56
⑤532+187+468-87
⑥(200+4)×25
⑦101×78
⑧27.89+2.3-7.89