四年级数学口算练习题500道(共8页).doc

精选优质文档-倾情为你奉上四年级口算练习（一）500题1388954005420034550450180006002700304514=89100=0.82+0.08=731=0.6310=410=171000=0.56+0.4=8025=1-0.93=1.25100=5.6+99=10025=90-0.9=41100=8800400=0.1210=60030=7.59100=150+70=356-98=1258=6126=1280=1.5100= 84040=0.125100=8100=2.3+3.6=0.28+0.12=7.3+2.7=7.5-3.4=1-0.35=3.610=5.6+2.3+0.7=5172=154-73-27=100025=24012=7.06100=7.610=