【蘇教版】小學三年級數(shù)學上冊課件-【第5課時 解決問題的策略】

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

千克和克·········································································28三長方形和正方形································································36周長是多少······································································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)和軸對稱··························································80七分數(shù)的初步認識（一）·······················································87多彩的“分數(shù)條”·····························································96八期末復習·········································································98蘇教版三年級上冊解決問題的策略明確題意整理條件選擇策略（明確條件和問題）（列表、畫線段圖……）解決問題解決問題的一般方法:整理復習從條件出發(fā)的策略從條件開始想起，可以確定先算什么，再算什么梳理條件的方法：簡化題意，幫助理解題意，明確數(shù)量關系。列表、畫線段圖首尾相同，兩端物體的數(shù)量＝中間物體的數(shù)量＋1；首尾不同，物體的數(shù)量相等。兩種物體間隔排列1.圖書館購進一批少兒圖書，其中《成語故事》42本，《寓言故事》比《成語故事》多18本，《童話故事》的本數(shù)是《寓言故事》的3倍。購進《童話故事》多少本？

《成語故事》《寓言故事》《童話故事》42本18本隨堂練習【選自教材第102頁第25題】寓言故事：42+18=60（本）

童話故事：60×3=180（本）答：購進《童話故事》180本。1.圖書館購進一批少兒圖書，其中《成語故事》42本，《寓言故事》比《成語故事》多18本，《童話故事》的本數(shù)是《寓言故事》的3倍。購進《童話故事》多少本？

【選自教材第102頁第25題】2.嶺南小學買了3捆楊樹苗，每捆14棵，買的松樹苗比楊樹苗少16棵。買了多少棵松樹苗？

松樹苗楊樹苗16棵14棵【選自教材第102頁第26題】2.嶺南小學買了3捆楊樹苗，每捆14棵，買的松樹苗比楊樹苗少16棵。買了多少棵松樹苗？

楊樹苗：3×14=42（棵）松樹苗：42–16=26（棵）答：買了26棵松樹苗。【選自教材第102頁第26題】3.校園里有兩個花圃（如下圖），正方形花圃的周長是56米，三角形花圃的周長比正方形花圃少8米。如果三角形花圃每邊柵欄的長度相等，每邊柵欄長多少米？

56米【選自教材第102頁第27題】56–8=48（米）48÷3=16（米）答：每邊柵欄長16米。56米48米4.在學校組織的繪畫展覽中，一年級的作品有30幅，二年級有45幅，三年級比一、二年級的總數(shù)少14幅，四年級比三年級的2倍少36幅。

根據(jù)上面的條件把下表填寫完整。

45618630+45–14=61（幅）61×2–36=86（幅）【選自教材第102頁第28題】間隔的個數(shù)總是比樹的棵數(shù)少1。湖濱路種著一排柳樹，每相鄰兩棵樹之間的距離是5米。小明從第1棵跑到第200棵，一共跑了多少米？第1棵樹第2棵樹1個5米第1棵樹第3棵樹2個5米【選自教材第102頁思考題】湖濱路種著一排柳樹，每相鄰兩棵樹之間的距離是5米。小明從第1棵跑到第200棵，一共跑了多少米？199個5米第1棵樹第