【蘇教版】小學(xué)三年級(jí)數(shù)學(xué)上冊(cè)課件-【第4課時(shí) 千克和克 分?jǐn)?shù)的初步認(rèn)識(shí)】

一兩、三位數(shù)乘一位數(shù)··························································1二

千克和克·········································································28三長(zhǎng)方形和正方形································································36周長(zhǎng)是多少······································································46四兩、三位數(shù)除以一位數(shù)·······················································48五解決問題的策略································································71間隔排列·········································································78六平移、旋轉(zhuǎn)和軸對(duì)稱··························································80七分?jǐn)?shù)的初步認(rèn)識(shí)（一）·······················································87多彩的“分?jǐn)?shù)條”·····························································96八期末復(fù)習(xí)·········································································98蘇教版三年級(jí)上冊(cè)千克和克分?jǐn)?shù)的初步認(rèn)識(shí)（一）整理復(fù)習(xí)1千克和克稱一般物品有多重，常用千克作單位。千克可以用字母“kg”表示。稱比較輕的物品，常用克作單位。克可以用字母“g”表示。1千克＝1000克（質(zhì)量單位）2分?jǐn)?shù)的初步認(rèn)識(shí)（一）讀作：四分之三分?jǐn)?shù)線分子分母其中的幾份平均分的份數(shù)平均分比較分?jǐn)?shù)大小的方法是：分子是1的分?jǐn)?shù)，分母越小，表示分的份數(shù)越少，其中的1份越大。

分子相同，分母小的分?jǐn)?shù)大。分成同樣多的份數(shù)，取的份數(shù)越多就越大。分母相同，分子大的分?jǐn)?shù)越大。分?jǐn)?shù)的簡(jiǎn)單計(jì)算：同分母分?jǐn)?shù)相加減，分母不變，只把分子相加減。

1可以看作是分子分母相同的分?jǐn)?shù)。1與分?jǐn)?shù)相減：1.在（）里填合適的單位。（1）一袋大米重25（）。（2）一袋水果大約重3（）。（3）一盒餅干重500（）。（4）一筐土豆重18（）。千克千克克千克隨堂練習(xí)【選自教材第101頁(yè)第19題】2.3千克=（）克9000克=（）千克8千克=（）克2000克=（）千克3000980002【選自教材第101頁(yè)第20題】3.2個(gè)橘子90克，一個(gè)橘子45克。50+20+20=90（g）90÷2=45（g）【選自教材第101頁(yè)第21題】4.用分?jǐn)?shù)表示涂色部分，并說說每個(gè)分?jǐn)?shù)的含義。

把圓平均分成4份，涂色部分占其中1份把三角形平均分成3份，涂色部分占其中2份把長(zhǎng)方形平均分成5份，涂色部分占其中2份【選自教材第101頁(yè)第22題】5.把一張長(zhǎng)方形紙對(duì)折、再對(duì)折……數(shù)一數(shù)每次對(duì)折后平均分成的份數(shù)，填在下表里，并說說每份各占這張紙的幾分之幾。

【選自教材第101頁(yè)第23題】48416532664對(duì)折次數(shù)每次增加1次，平均分成的份數(shù)就等于原來的2倍。6.一塊布的

做上衣，做褲子。你會(huì)用不同的顏色在下面的大長(zhǎng)方形中表示做上衣的布和做褲子的布嗎？

上衣褲子【選自教材第101頁(yè)第24題】（1）做上衣和褲子一共用了這塊布