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1、苏教版小学数学四年级上册,练 习 二,练习二,1,18020,7010,30060,9,7,5,32040,35070,72090,8,5,8,练习二,2,2,0,8,0,2,0,8,5,练习二,2,0,2,1,0,4,0,9,4,3,2,练习二,3用竖式计算,并验算。,9920,4,0,8,9,1,验算,20 4 80 19 99,=4,练习二,3用竖式计算,并验算。,51090,0,5,0,5,6,4,验算,90 5 450 60 510,=5,练习二,3用竖式计算,并验算。,35750,0,5,7,7,3,验算,50 7 350 7 357,=7,练习二,3用竖式计算,并验算。,2658
2、0,0,4,5,3,2,2,验算,80 3 240 25 265,=3,练习二,4,60分( )时,180分( )时,420分( )时,60秒( )分,300秒( )分,540秒( )分,1,3,7,1,5,9,练习二,5一只东北虎的体重是200千克,一只金钱豹的体重是50千克。东北虎的体重是金钱豹的几倍?,200504,答:东北虎的体重是金钱豹的4倍。,练习二,6,3,9,0,6,0,6,0,2,0,2,8,0,5,9,4,0,1,1,9,1,5,0,2,0,2,0,4,0,0,0,练习二,7算一算,比一比。,0,2,2,1,1,0,0,3,4,5,2,4,6,2,1,0,4,32420,3
3、2460,练习二,7算一算,比一比。,0,3,5,1,1,0,5,4,6,9,6,5,5,1,0,6,45630,45650,练习二,7算一算,比一比。,0,4,5,1,0,4,2,5,6,5,1,4,0,5,45540,25540,1,1,练习二,8花花有388枝玫瑰花,每30枝扎成一束,可以扎成几束,还剩多少枝?,3883012(束)28(枝),答:可以扎成12束,还剩28枝。,练习二,94种昆虫飞行时翅膀每秒振动的次数如下表:,(1)苍蝇翅膀每秒振动的次数是蜻蜓的多少倍?,3603012,答:苍蝇翅膀每秒振动的次数是蜻蜓的12倍。,练习二,94种昆虫飞行时翅膀每秒振动的次数如下表:,(2
4、)你还能提出什么问题?,练习二,10,45050,28070,18090,508,704,902,9,400,4,280,2,180,练习二,11先说出商是几位数,再计算。,8730,82040,2,0,6,7,2,0,0,2,2,8,0,练习二,11先说出商是几位数,再计算。,0,6,5,4,7,6,62480,81660,0,6,1,1,6,3,8,0,6,3,2,1,练习二,12,90030060,(60090)30,163040,750(2327),9005,54030,895,18,48040,75050,120,15,练习二,13,4,4,4,4,4,练习二,14青山果园收获了300箱苹果和260箱梨,一辆卡车每次能运40箱,多少次才能全部运完?,(300260)4014(次),答:14次才能全部运完。,练习二,15王大伯准备围一块360平方米的长方形地培育树苗。如果这块地长90米,宽应该是多少米?如果长分别是60米、40米、30米或20米呢?,4,6,9,12,18,