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1、R,四年級(jí)上冊,練習(xí)八,教材,P49,練習(xí)八,T1,1.,先筆算,再用計(jì)算器驗(yàn)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,練習(xí)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,練習(xí)八,T1,54145=,1,5,4,5,8,0,5,2,7,7,8,3,0,4,
2、5,7830,43139=,1,4,3,4,1,7,6,5,5,5,9,7,7,3,9,5977,教材,P49,練習(xí)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,練習(xí)八,T2,2.,某市郊外的森林公園有,124,公頃森林。,1,公頃森林一年可滯塵,32,噸,一天可從地下吸出,85,噸水。,(,1,)這個(gè)公園的森林一年可滯塵多少噸?,(,2,)這個(gè)公園的森林一天可從地下吸出多少噸水?,(,1,),12432=,1,3,2,2
3、,4,8,2,7,3,3,9,6,8,2,4,3968,(噸),(,2,),12485=,1,8,5,6,2,0,2,9,9,0,5,4,0,2,4,1,10540,(噸),答:這個(gè)公園的森林一年可滯塵,3968,噸,一天可以從地下吸出,10540,噸水。,教材,P49,練習(xí)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.,神舟九號(hào)飛船繞地球一圈大約需要,90,分鐘,,它繞地球運(yùn)行,201,圈需要多少時(shí)間?,教材,P49,練習(xí)八,T4,20
4、190=,2 0 1,9 0,0,9,0,1 8,18090,(分鐘),答:它繞地球運(yùn)行,201,圈需要,18090,分鐘。,教材,P49,練習(xí)八,T5,5.,動(dòng)物園的兩頭大象一天要吃,350,千克食物,飼養(yǎng)員準(zhǔn)備了,5,噸食物,夠這兩頭大象吃,20,天嗎?,35020=,3 5 0,2 0,0,0,7,0,7000,(千克),7000,千克,=7,噸,7,噸,5,噸,答:不夠這兩頭大象吃,20,天。,【,課本,49,頁“練習(xí)八”第,5,題,】,教材,P49,練習(xí)八,T6,6.,在 中填上“,”“,”或“,=,”。,12020,12200,50010,10550,16400,2104,1930
5、0,30180,=,教材,P49,練習(xí)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,練習(xí)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,練習(xí)八,T7,22
6、430,30415,2,3,0,7,2,6,2,4,0,=6720,3,1,5,2,0,4,0,4,5,6,0,0,4,1,5,3,=4560,教材,P50,練習(xí)八,T8,8.,說出下面計(jì)算中的錯(cuò)誤,并改正過來。,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,用哪個(gè)數(shù)去乘,乘得的積與哪個(gè)數(shù)對齊。,哪個(gè)數(shù)滿,10,就向前進(jìn),1,。,1 0,1 0,0,1 3,教材,P50,練習(xí)八,T9,9.,學(xué)校要為圖書館增添兩種新書,每種各買,3,套。一共要花多
7、少錢?,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,練習(xí)八,T10,10.,張叔叔種植了品種繁多的觀賞蔬菜,其中,一部分蔬菜的價(jià)格和賣出的盆數(shù)如下表。,(,1,)每種蔬菜賣了多少元?,(,2,)張叔叔賣這,3,種蔬菜一共收入多少元?,教材,P50,練習(xí)八,T10,(,1,)每種蔬菜賣了多少元?,西紅柿:,14135=1890,(元),袖珍南瓜:,15140=2100,(元),辣椒:,12302=3624,(元),答:辣椒賣了,3624,元,西紅柿賣
8、了,1890,元,袖珍南瓜賣了,2100,元。,教材,P50,練習(xí)八,T10,3624+1890+2100=7614,(元),答:一共收入,7614,元。,(,2,)張叔叔賣這,3,種蔬菜一共收入多少元?,教材,P50,練習(xí)八,T11,11.,李老師帶了,3000,元,要為學(xué)校選購,15,臺(tái)同樣的電話機(jī),有多少種購買方案?分別還剩多少錢?,1,2,3,4,128,元,108,元,198,元,210,元,教材,P50,練習(xí)八,T11,電話機(jī),需要的錢,/,元,剩余的錢,/,元,1,2,3,4,12815=1920,3000-1920=1080,10815=1620,3000-1620=1380,19815=2970,3000-2970=30,21015=3150,有,3,種購買方案,128,元,108,元,198,元,210,元,教材,P50,練習(xí)八,T12,12,*,.,用,0,、,2,、,3,、,4,、,5,組成三位數(shù)乘兩位數(shù)的乘法 算式,你能寫出幾個(gè)?你能寫出乘積最大的算式嗎?,52043=22360,或,43052=22360,數(shù)的高位的數(shù)字越大,其值就越大。,