《.《釘子板上的多邊形》ppt課件 小學(xué)五年級(jí)數(shù)學(xué)上冊(cè) 蘇教版》由會(huì)員分享,可在線閱讀,更多相關(guān)《.《釘子板上的多邊形》ppt課件 小學(xué)五年級(jí)數(shù)學(xué)上冊(cè) 蘇教版(11頁(yè)珍藏版)》請(qǐng)?jiān)谘b配圖網(wǎng)上搜索。
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8.4《釘子板上的多邊形》ppt課件 小學(xué)五年級(jí)數(shù)學(xué)上冊(cè) 蘇教版
第8單元 用字母表示數(shù) 4 釘子板上 的多邊形 學(xué)習(xí)目標(biāo) 1.使學(xué)生在操作、觀察、猜測(cè)、驗(yàn)證等活動(dòng)中,發(fā) 現(xiàn)在釘子板上圍出的多邊形與它的邊所經(jīng)過(guò)的釘子 數(shù),以及多邊形內(nèi)部釘子數(shù)的關(guān)系,會(huì)用含有字母 的式子表示發(fā)現(xiàn)的規(guī)律。 2.使學(xué)生在探索規(guī)律、發(fā)現(xiàn)規(guī)律和表達(dá)規(guī)律的過(guò)程 中,進(jìn)一步感受數(shù)學(xué)抽象的意義,培養(yǎng)比較、分析 和簡(jiǎn)單推理的能力,增強(qiáng)發(fā)現(xiàn)問(wèn)題、提出問(wèn)題的意 識(shí),積累數(shù)學(xué)活動(dòng)經(jīng)驗(yàn)。 復(fù)習(xí)導(dǎo)入 復(fù)習(xí)導(dǎo)入 復(fù)習(xí)導(dǎo)入 引出問(wèn)題 ● ● ● ● ● ● 數(shù)一數(shù),下面圖形的面積? 1㎝ ● ●
2、 ● ● ● ● ● ● ● ● ● ● ● ● 1㎝ ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
3、 ● ● ● ● ● ?● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● 引出問(wèn)題 1厘米 厘 米 數(shù)一數(shù),下面圖形的面積? 1 引出問(wèn)題 1厘米 厘 米 數(shù)一數(shù),下面圖形的面積? 1 ? ? ? ? 激活猜想 ● ● ● ● ● ● ● ● ● ● ● ● 1㎝ ● ● ● ● ● ● 1、 ㎝ ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● 、 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
4、● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ① ● ● ● ● ● ● ② ● ● ● ● ③ ● ● ● ● ④ ● ● ● ● 圖形編號(hào) 多邊形的面積/平 方厘米 多邊形邊上的釘子 數(shù)/枚 ① ② ③ 2 3 3.5 4 ④ 4 6 7 8 激活猜想 圖形編號(hào) ① ② ③ S=n÷2 多邊形的面積 多邊形邊上的 /平方厘米 (s) 釘子數(shù)/枚 (n) 2 3 3.5 4 6 7 ④ 4 8 數(shù)學(xué)是研究千變
5、萬(wàn)化中不變的規(guī)律 ——開(kāi)普勒 進(jìn)行驗(yàn)證 1㎝ ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● 1㎝ ● ● ● ● ● ● ● ● ● ● 、 ● 、 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● n=10 s=6 ● ● ● ● ● ● ● ● n=9 s=5.5 ● ●
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