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R,四年级上册,练习八,教材,P49,练习八,T1,1.,先笔算,再用计算器验算。,16432=,5248,21783=,1,3,2,3,2,8,2,9,4,5,2,4,8,6,4,1,1,1,1,2,8,3,6,5,1,6,3,7,8,0,1,1,1,7,5,1,1,2,1,1,1,18011,教材,P49,练习八,T1,25436,=9144,2,3,6,5,2,4,2,6,7,9,1,4,4,5,4,1,32825,3,2,5,6,4,0,6,5,6,8,2,0,0,2,8,1,=8200,教材,P49,练习八,T1,54145=,1,5,4,5,8,0,5,2,7,7,8,3,0,4,5,7830,43139=,1,4,3,4,1,7,6,5,5,5,9,7,7,3,9,5977,教材,P49,练习八,T1,53745,87165,=24165,5,4,5,6,8,5,8,4,1,4,1,6,5,3,7,2,2,2,1,8,7,1,5,5,0,2,3,4,3,5,5,6,5,1,1,1,=14355,教材,P49,练习八,T2,2.,某市郊外的森林公园有,124,公顷森林。,1,公顷森林一年可滞尘,32,吨,一天可从地下吸出,85,吨水。,(,1,)这个公园的森林一年可滞尘多少吨?,(,2,)这个公园的森林一天可从地下吸出多少吨水?,(,1,),12432=,1,3,2,2,4,8,2,7,3,3,9,6,8,2,4,3968,(吨),(,2,),12485=,1,8,5,6,2,0,2,9,9,0,5,4,0,2,4,1,10540,(吨),答:这个公园的森林一年可滞尘,3968,吨,一天可以从地下吸出,10540,吨水。,教材,P49,练习八,T3,3,.,口算,。,5090=40,80=,32,30=1905=,70140=300,30=,21,40=2530=,4500,3200,960,950,9800,9000,840,750,4.,神舟九号飞船绕地球一圈大约需要,90,分钟,,它绕地球运行,201,圈需要多少时间?,教材,P49,练习八,T4,20190=,2 0 1,9 0,0,9,0,1 8,18090,(分钟),答:它绕地球运行,201,圈需要,18090,分钟。,教材,P49,练习八,T5,5.,动物园的两头大象一天要吃,350,千克食物,饲养员准备了,5,吨食物,够这两头大象吃,20,天吗?,35020=,3 5 0,2 0,0,0,7,0,7000,(千克),7000,千克,=7,吨,7,吨,5,吨,答:不够这两头大象吃,20,天。,【,课本,49,页“练习八”第,5,题,】,教材,P49,练习八,T6,6.,在 中填上“,”“,”或“,=,”。,12020,12200,50010,10550,16400,2104,19300,30180,=,教材,P49,练习八,T7,7.,12073,46205,18247,=8760,1,7,3,3,6,4,8,8,7,6,0,2,0,2,4,6,3,0,0,2,9,4,3,0,0,5,1,2,8,=9430,1,4,7,7,4,8,2,8,5,5,4,8,2,1,2,7,=8554,教材,P49,练习八,T7,25060,28103,27142,=15000,2,6,0,0,0,5,1,5,0,0,1,2,8,2,4,6,0,2,8,8,4,0,3,8,2,=2884,1,2,7,9,4,4,8,3,8,3,4,4,2,9,2,=3834,教材,P50,练习八,T7,22430,30415,2,3,0,7,2,6,2,4,0,=6720,3,1,5,2,0,4,0,4,5,6,0,0,4,1,5,3,=4560,教材,P50,练习八,T8,8.,说出下面计算中的错误,并改正过来。,1,1,6,8,0,4,4,3,1,9,3,8,3,4,3,3,2,6,8,4,6,2,9,9,4,4,4,2,9,5,2,6,0,2,4,8,0,1,1,0,4,0,4,4,3,4,4,2,1,用哪个数去乘,乘得的积与哪个数对齐。,哪个数满,10,就向前进,1,。,1 0,1 0,0,1 3,教材,P50,练习八,T9,9.,学校要为图书馆增添两种新书,每种各买,3,套。一共要花多少钱?,1253=375,(元),183=54,(元),375+54=429,(元),125+18=143,(元),1433=429,(元),答:一共要花,429,元。,方法一,方法二,教材,P50,练习八,T10,10.,张叔叔种植了品种繁多的观赏蔬菜,其中,一部分蔬菜的价格和卖出的盆数如下表。,(,1,)每种蔬菜卖了多少元?,(,2,)张叔叔卖这,3,种蔬菜一共收入多少元?,教材,P50,练习八,T10,(,1,)每种蔬菜卖了多少元?,西红柿:,14135=1890,(元),袖珍南瓜:,15140=2100,(元),辣椒:,12302=3624,(元),答:辣椒卖了,3624,元,西红柿卖了,1890,元,袖珍南瓜卖了,2100,元。,教材,P50,练习八,T10,3624+1890+2100=7614,(元),答:一共收入,7614,元。,(,2,)张叔叔卖这,3,种蔬菜一共收入多少元?,教材,P50,练习八,T11,11.,李老师带了,3000,元,要为学校选购,15,台同样的电话机,有多少种购买方案?分别还剩多少钱?,1,2,3,4,128,元,108,元,198,元,210,元,教材,P50,练习八,T11,电话机,需要的钱,/,元,剩余的钱,/,元,1,2,3,4,12815=1920,3000-1920=1080,10815=1620,3000-1620=1380,19815=2970,3000-2970=30,21015=3150,有,3,种购买方案,128,元,108,元,198,元,210,元,教材,P50,练习八,T12,12,*,.,用,0,、,2,、,3,、,4,、,5,组成三位数乘两位数的乘法 算式,你能写出几个?你能写出乘积最大的算式吗?,52043=22360,或,43052=22360,数的高位的数字越大,其值就越大。,
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