• <var id="rhcsu"><u id="rhcsu"></u></var>
    <meter id="rhcsu"></meter><output id="rhcsu"></output>

    <code id="rhcsu"><ol id="rhcsu"></ol></code>

    <acronym id="rhcsu"></acronym>
    
    

      <dd id="rhcsu"></dd>

      歡迎來到原中小學教育資源網!

      乘法的估算教學反思

      教學反思 時間:2019-07-04 我要投稿
      【www.51cxty.com - 教學反思】

        四月份,我們三年組到千金小學聽了一節數學課----《乘法估算》。一直覺得最難上的便是估算課,沒有標準的答案可言。學生的想法各異,甚至有的學生算出標準答案然后再進行估算,對估算的意義理解不夠。

        這節課從開課就努力創設問題情境,讓學生在已有的知識經驗基礎上進行數學活動,探索“兩位數乘兩位數的估算方法”,接著引導學生聯想日常生活中的情景,讓估算走進日常生活,逐步培養學生主動參與估算的興趣,而教學中教師的“適時點撥”也起到了“穿針引線”的作用,本節課達到了“人人學有價值的數學”的目標,是一節運用“情境教學”比較成功的課例。

        但本節課教學也有以下兩點值得思考:估算時,方法雖不確定,但必須符合以下兩個要求:一是符合實際,能否在課前安排學生多角度、多方位尋找生活中一些估算乘法的例子,使其更加貼近生活情境。二是計算方便。在具體的實例當中讓學生體會到估算的實用價值及意義,避免算出準確結果之后再估算。例如,本節課的題目是每排22個座位,一共18排,有350名學生來聽課,能坐下嗎?這道題共有三種估算方法,在本冊的估算中,第一次提到在生活中要正確合理的運用估算。22×18第一種:把18看成20,把22看成20.第二種:18看成20,22不動。第三種:18不動,把22看成20。經過學生間的激烈討論,大家你一言我一語各抒己見。在討論慢慢發現了第三種方法的優越性。符合實際又方便計算,體會到了估算帶給我們的便捷。

        其次,可否對學生提交的估算方法進行歸類。如:①有的估算時,是把兩位數看成小于原數的整十數,比如72看成70;②有的估算時,是把兩位數看成大于原數的整十數,如58看成60……。這樣,便于形成估算的靈活性.針對具體問題選擇正確的估算方法,例如,今天的這個例題結合問題的要求,把結果估小一些比較合適,

        因此,教學時要重視估算訓練,只有在實際情境中,才能產生多樣化的估算方法。單純地進行機械的估算訓練,是難以提高學生解決實際問題的能力的。只有結合日常生活進行訓練,體驗估算的方法,明確估算還應根據實際情況靈活應用,才能提高學生估算能力。

        鑒于以上的認識,我覺得學生估算習慣的培養與能力的提高很大程度上取決于教師的估算意識。在平時的教學中,我充分挖掘估算題材,在教學中重視進行估算示范,使學生認識到估算的必要性和優越性。積極創設生活情境,促使學生靈活采取估算策略。學生在教師預設的情境中意識到根據不同情況采用不同的估算策略,使學生的估算能力得到提高,并在自主探索中解決了問題。

      熱門文章
      268彩票平台268彩票主页268彩票网站268彩票官网268彩票娱乐 www.56655z.com | www.89888.com | www.3066hg.com | 258701.com | www.52062i.com | www.hg771122.com | 138.am | www.03882.cc | www.qxw150.com | pj88yy.com | www.394511.com | www.m80288.com | www.339688n.com | payu360.com | www.701wb.com | www.4052i.com | 40033ddd.com | www.77802v.com | www.6687n.com | www.8xinhao.com | 1211.cc | www.hm3666.com | www.365044.bet | hg0886.ws | 5443ee.com | www.3978y.com | www.vs88.com | 500000951.com | 7141xx.com | www.7793f.com | www.998762.com | 2905.cc | 52599f.com | www.8667z.com | www.706222.com | hhh8827.com | js58881.com | www.hf5885.com | www.9737kk.com | www.00396.com | 776091com | www.669202.com | www.129088.com | www.67797a.com | aaa5701.com | www.092603.com | www.0967002.com | www.js888200.com | 2643l.com | hr466.com | www.927633.com | www.91779y.com | www.792suncity.com | 56822.com | 2934j.com | www.5086j.com | www.388msc.com | 5855kk.com | 4995e.com | cidubbs.com | www.81678b.com | www.c5c55.com | 5429g.com | 0038.com | 66999193.com | www.877802.com | www.7920c.com | www.965082.com | j83377.com | 1443d.com | www.78700a.com | www.33598x.com | www.bwinyz01.com | www.xpj1969.com | agg0606.com | 7720g.com | 16690088.com | www.78115555.com | www.57800z.com | 234916.com | www.361550.com | www.2350o.com | www.09559.cc | www.2109i.com | www.81678b.com | www.89777q.com | www.6889796.com | www.r98478.com | www.100a56.com | www.js58111.com | www.60886r.com | www.18617.com | www.0622yyy.com | www.58404c.com | www.xj7003.com | www.xpj8558.com | www.55717h.com | www.7737bb.com | www.0088hgdd.com | www.3zq04.com | www.50080k.com | www.5086a.com | www.66652c.com | www.a.1308pj.com | www.xpj33987.com | www.js000a.com | www.54400q.com | www.22czt.com | www.c6121.com | www.925073.com | www.659789.com | www.339361.com | www.35918u.com | 86601.com | 8538e.com | 2698i.com | vns8y.com | b4255.com | 8721331.com | 500000754.com | 38989p.com | www.z0888.com | www.32329193.com | www.49981k.com | www.591111.com | www.551c93.com | www.hg8uu.com | www.40288l.com | www.55717h.com | www.35918x.com | www.0014s.com | www.912193.com | www.550436.com | 3936w.com | 1591002.com | 44077n.com | 3846ff.com | 8189891.com | www.010xpj.com | www.14086622.com | www.77731b.com | www.99113s.com | www.80188n.com | www.3a002.com | www.77114g.com | www.900241.com | www.60108i.com | 188qq777.com | 37111m.com | 00048p.com | www.p2666.com | www.hg2216.com | www.00618e.com | www.48330x.com | www.6832r.com | www.355711.com | bwin910.co | 3122s.com | 8381oo.com | www.yl444.com | www.4041.cc | www.80188z.com | www.a387387.com | www.754880.com | zhcp72.com | 8381xx.com | 72239.com | www.cr589.com | www.msc855.com | www.73990y.com | www.76520b.com | www.595707.com | 9539l.com | 5309b.com | feicai0479.com | www.ty7000.com | www.l9478.com | www.a63568.com | www.ya949.com | 1147.com | 40033j.com | 3844p.com | www.v58854.com | www.19019f.com | www.ykylc01.com | www.603854.com | 23233p.com | 3559tt.com | www.7435u.com | www.kk2229.com | www.4078d.com | www.36166q.com | www.89894f.com | 00ww8331.com | 90856m.com | www.40686b.com | www.07679j.com | www.11csj.com | 365355.com | 3559vvv.com | www.cr508.com | www.5504y.com | www.85144aa.com | www.533265.com | 2709h.com | 7744kkk.com | www.333460.com | www.9895l.com | www.00840j.com | 33dd8332.com | f32365.com | www.yh06789.com | www.57800a.com | www.918ar.com | 22555156.com | 54240099.com | www.878msc.com | www.js89u.vip | www.770001.com | 3467h.cc | www.yh8005.com | www.c555.cc | www.5091n.com | 5003ttt.com | 2997700.com | www.jx5544.com | www.89777c.com | buyu981.com | 3868oo.cc | www.q9163.com | www.jsyl.cm | www.36166u.com | dh0853.com | www.v6558.com | www.99094c.com | www.330192.com | 86611z.com | www.xpj97.com | www.13434b.com | hg95950.com | 86811l.com | www.esb116.net | www.60108s.com | 5446aa.com | 2247z.com | www.cp67776.com | www.m.55xj.vip | 1669q.com | 33665003.com | www.a83377.com | www.514677.com | 30688h.com | www.999e888.com | www.349229.com | 89777p.com | p533.cc | www.9737ww.com | www.910336.com | 44335156.com | www.975426.com | www.aa355.com | 20776688.com | 0434322.com | www.5504j.com | www.904861.com | 0667.com | www.71234010.com | www.32123b.com | 2934com.com | www.yxlm33.com | www.33678qq.com | 4195y.com | 2546j.com | www.917090.com | www.197093.com | 8577l.cc | www.706139.com | www.68682a.com | 22291144.com | www.4521p.com | v995.com | 776059.com | www.533880.com | www.183799.com | pj08444.com | www.4996ln.com | 99567g.com | 5443v.com | www.45598m.com | 1855.com | www.64400a.com | www.7036gg.com | 5509i.com | www.aicaicc.com | www.3691b.com | qijiduchang.vip | www.70088hg.com | www.35898c.com | 2018nsb.com | www.pj01.com | www.775740.com | 22uu8331.com | www.o32031.com | 111p1.cc | www.40889.com | www.926280.com | 69111a.com | www.js89x.vip | 33318s.com | www.23488v.com | www.689044.com | 518cp-4.com | www.6547.com | ooo0022.com | www.c44gg.com | 1408t.com | www.39695i.com | www.1368f.cc | v2299.com | www.42070012.com | 88993o.com | www.3122vv.com | www.91233i.com | www.pj7987.com | www.66653.com | 7726mmm.com | www.47506p.com | l58955.com | www.s | vns1.vip | www.hg9388.org | www.560529.com | 09758.com | www.6611b.cc | 111122qq.com | www.81678c.com | 4136w.com | www.60886h.com | 8159zz.cc | www.rgcp.vip | feicai0530.com | www.005004.com | 55331w.com | www.hg3058.com | www.495358.com | www.pjbet444.com | www.880686.com | amjzh.top | www.3933j.cc | 444p1.cc | www.8816z.com | 3225k.com | www.904028.com | 33382ii.com | www.9989572.com | 4018h.com | www.156a56.com | yh66222.com | www.178441.com | xpj5009.com | www.63606j.com | 8381f.com | www.06400.com | 86226d.com | www.29937.com | 6677bet.vip | www.js18456.com | 8037iii.com | www.087k.com | 3651462.com | www.926530.com | 6261bb.com | www.15355i.com | dd2205.com | www.9149q.com | bifa810.com | www.caim3.com | www.518hwx.com | www.645326.com | www.39695r.com | www.330716.com | www.066005.com | P35o.com | www.pj55585.com | 776072.com | www.dzcp5555.com | 33599bb.com | www.4058hh.com | dzj0707.com | www.7681003.com | 2146e.com | www.73166b.com | 7935x.com | www.c9661.com | www.yh7890.com | www.186769.com | www.pj5718.com | 5000008018.com | www.7415ii.com | 2820o.com | www.4102s.com | 365vip800.cc | www.50051vip.com | www.38200e.com | www.196052.com | www.xz1088.com | 80850ee.com | www.o1432.com | 32212z.com | www.57578g.com | www.68666z.com | www.330732.com | www.long987.com | am56.cc | www.704909.com | s40033.com | www.56666.cc | www.309999.com | 30006dz.com | www.mhcpgw.com | 7893500.com | www.ampj3433.com | 11162018.com | www.315332.com | www.3987999.com | 9679t.com | www.68365l.com | 3169f.com | www.599047.com | www.00355a.com | 0343e.com | www.1764c.com | 2506g.com | www.375805.com | www.99828.com | 33013.com | www.hg3222.com | www.hg990033.com | zz2205.com | www.99vn777.com | 17797777.com | www.799243.com | www.60sun.com | 5003ppp.com | www.9646w.com | www.32126q.net | hd2629.com | www.06386677.com | 8290b.com | www.330291.com | www.5504h.com | 13111.com | www.hx1161.com | www.hg9698.com | 333hg.com | www.35918r.com | www.330099r.com | sqrc8.com | www.6678685.com | www.amh50.com | 2998u.com | www.9187p.com | 55339193.com | 1624bb.com | www.xpj915.com | www.6033k.com | 9030d.com | www.7920d.com | www.hg22768.com | 4880a.com | www.4520099.com | www.76060p.com | 7744vvv.com | www.win1231.com | www.8494y.com | 5betbet365.com | www.9422j.com | www.7380m.com | 1216.com | www.9478y.com | www.31229.com | 3467.cc | www.836595.com | www.803503.com | 8977vv.com | www.001036.com | www.62979w.com | www.9566948.com | 1408d.com | www.84499d.com | www.223228.com | xc860.top | www.848766.com | www.bd2019e.com | 6220j.com | 2349001.com | www.09738.com | www.77537w.com | jsgj55.com | www.987931.com | www.661559.com | 3434c.com | 5004nn.com | www.98478.com | www.vns88811.com | 7052004.com | www.490680.com | www.2021z.com | www.682855.com | hg999333i.com | www.44czt.com | www.c44yy.com | xpj888a.com | 2934l.com | www.26878k.com | www.n2678.com | 2383qq.com | 4636622.com | www.7239y.com | www.5555566666.com | 45637a.com | www.33112i.com | www.4245.com | www.hnjxjd.cn | 04666a.com | www.196073.com | www.cc4625.com | www.w1525.com | hr1833.com | vip68dl.com | www.0601b.com | www.806070.com | 157168.com | 77606u.com | www.4444y.cc | www.hg173c.com | www.bm1100.vip | 188qq444.com | www.584211.com | www.89386a.com | www.18438e.com | 61322299.com | aoyu22.com | www.9205e.com | www.88166s.com | www.333222z.com | 3678f.com | www.50064o.com | www.115966.com | www.huidasj.com | 1288gg.com | 68228l.com | www.230278.com | www.amdwc.net | www.tyc788.com | 15a16.net | hga55025.com | www.52072o.com | www.529776.com | www.twcp00.com | www.pj8858.com | 3678pp.com | www.097968.com | www.7714y.com | www.yf370.com | www.483828.com | 3614m.com | 500500.com | www.011888a.com | www.xpj8819.com | www.066983.com | xx888i.com | 0723.com | 6641qq.com | www.cb7588.com | www.56011q.com | www.3165.com | www.hg00555.com | 3807i.com | a4255.com | www.739915.com | www.5953688.com | www.58665k.com | www.21365aa.com | 86811r.com | p61653.com | 776314.com | www.6364.com | www.56011r.com | www.hg7760.com | www.vns8n8.com | 38850055.com | pj88ll.com | c388v.com | www.11qxc.com | www.557755.com | www.79900.com | www.as0008.com | 20550452.com | 8901.com | 9539g.com | www.876899.com | www.727563.com | www.h80288.com | www.52564.com | www.vns383.com | 7686q.com | 0001164.com | 00115003.com | www.399150.com | www.15199.cc | www.j94600.com | www.808888k.com | www.99206u.com | www.1869l.com | 00kk8332.com | 7720s.net | d3410.com | www.195322.com | www.qmfc7.com | www.u8999.com | www.80188j.com | www.729696.com | www.88837o.com | lehu556.com | js004.com | 73055w.com | 00116556.com | 7893005.com | www.526901.com | www.0014n.com | www.3328229.com | www.00773i.com | www.9009798.com | www.9679s.com | www.hg11768.com | 500000830.com | 6218jj.com | 08778t.com | sn6059.com | 500000512.com | www.168767.com | www.802865.com | www.6769x.com | www.2020788.com | www.44118m.com | www.dzj9990.com | www.0241n.com | www.68003.com | www.n27229.com | www.6060xj.com | 1318345.com | app4377.com | tt38648.cc | 7799sj.com | 22117e.com | 1259c.com | 547902.com | 50000997.com | xianboba.com | www.178215.com | www.560265.com | www.912453.com | www.48wcp.com | www.07163s.com | www.99677k.com | www.4331e.com | www.l63568.com | www.99552dd.com | www.93955c.com | www.5099yy.com | www.8885888.com | www.ao499.com | 033i.net | 4638844.com | 272gg.net | 3122b.com | 56988j.com | 8290o.com | 6261v.com | 8696.cc | x33i.vip | vic82.com | 3522b.vip | bwin8b.com | 655660077.com | 87965uu.com | bet33318.com | 6261k.com | c86811.com | 86811kk.com | 1679c.com | 1077lll.com | 518cp0.com | 7935b.com | 23066.com | z88rr.com | www.a2a444.cc | www.80088hg.com | www.vns6005.com | www.7380m.com | www.117390.com | www.55008040.com | www.11114100.com | www.hg6266.com | www.44508.com | www.890555.com | www.lfcp095.com | www.cp009x.com | www.sb5503.com | www.46630.vip | www.07679v.com | www.7240m.com | www.9522888.com | www.80065q.com | www.7782n.com | www.hj2111.com | www.775020.com | www.315332.com | 3616d.com | zzylc6.com | 667766m.com | 1104.com | c600.com | 55797q.com | 228888w.com | www.280280.com | www.588sun.com | www.90585.com | www.js5599.vip | www.16181z.com | www.ba507.com | www.fg9908.com | www.50080p.com | www.hj7776.com | www.444216.com | 66300vip45.com | cc56988.com | mg437788.com | vvv40033.com | 2649tt.com | www.14555a.com | www.dy1166.com | www.c53889.com | www.89677w.com | www.55717q.com | www.07163z.com | www.729133.com | 132ag88.com | js06.app | 915906728.com | 85722.com | www.882236f.com | www.36677e.com | www.jjjj003.com | www.115527r.com | www.4331l.com | www.911137.com | www.89599k.com | www.436bbb.com | www.50080z.com | www.689477.com | baizun456.com | 36401144.com | 7742gg.com | js14z.com | www.4052i.com | www.c5c55.com | www.1861222.com | www.74972.com | www.493552.com | 0015pp.com | 005873.com | 65005u.com | www.06068006.com | www.233449.com | www.30350l.com | www.50788y.com | www.513550.com | zhcp17.com | 67888w.cc | jimei6666.com | www.17828z.com | www.5446nn.com | www.088014.com | www.761996.com | 188.cc | q4389.com | 5004ss.com | www.jing6663.com | www.89677b.com | www.87668z.com | www.451956.com | 2229822.com | bet28z.com | www.05a88.com | www.3157666.com | www.3421.com | www.hr4888.com | jnbzsj.com | dhy.cc | 20041.com | www.39333.com | www.2566.com | www.lqc4.com | 99306w.com | 41188822.com | www.7435b.com | www.819msc.com | www.t09738.com | www.646959.com | feicai0954.com | tz6.com | www.32666p.com | www.11vn777.com | www.23579d.com | bjocfju.cn | 060nnn.com | 1770g.com | www.hv1818.com | www.984702.com | www.638807.com | 34545.com | 707144.com | www.xpj1969.com | www.07679c.com | www.949429.com | js14x.com | qq365u.com | www.xb0028.com | www.6386a.com | www.c1981.com | r61788.com | 22299tt.com | www.5320jjj.com | www.52062a.com | www.632750.com | qqq4165.com | 3544w.com | www.006357.com | www.88266h.com | 5906ll.com | 8037ttt.com | www.9679n.com | www.99552ii.com | www.712887.com | 195668.com | 15a39.net | www.c44tt.com | www.23579b.com | bet888777.com | 88851v.com | www.hg93777.com | www.1358004.com | www.89894u.com | 65365.com | www.fedxb.com | www.63606m.com | www.595953.com | yz57.com | www.bet36576.com | www.ldz333.com | www.735898.com | dz3388.com | www.32126v.net | www.8j3.com | www.638806.com | alpk8.com | www.xpjvip07.com | www.733485.com | www.545669.com | 874755.com | www.8188zr.com | www.7920v.com | www.097067.com | 1005.vip | www.js936.com | www.90305d.com | 39558899.com | 0747vv.com | www.0849j.com | www.c5986.com | 33382ff.com | www.bet365a4.com | www.614586.com | www.178675.com | 11005v.com | www.789030.com | www.33112f.com | 77151.com | www.bjd333.com | www.458633.com | www.362477.com | hg28866.com | www.55690.com | www.51550.cc | 44999193.com | www.tushan08.com | www.5446x.com | 88851m.com | gg2649.com | www.580975.com | www.776873.com | 3421a.com | www.xin8884.com | www.66201.cc | 44005002.com | www.77537e.com | www.606010.com | 67890ppp.com | www.0686333.com | www.07679n.com | 18775m.com | 8577m.cc | www.k7764.com | www.106265.com | a72227.com | www.80jsjs.com | www.503433.com | 2078i.com | www.20199mm.com | www.712012.com | 3300hhgz.com | www.2266601.com | www.854980.com | e4255.com | www.76773.com | www.820335.com | 66287g.com | www.55526t.com | www.694977.com | bet28j.com | www.5504w.com | www.544086.com | 55545n.com | www.65066cc.com | www.217880.com | feicai0531.com | www.6880hh.com | 66093399.com | 1408o.com | www.495.ee | 8577e.cc | www.995g.net | www.66652g.com | 0080u.com | www.902488.com | www.977657.com | afcp06.com | www.19019r.com | www.098303.com | 2455d.com | www.632bbb.com | 55cc.com | www.9679n.com | www.6832x.com | 3522bb.cc | www.68199.com | www.210715.com | 2505am.com | www.d63568.com | 4477634.com | www.zr918.com | www.ascp9.com | 81207as3.com | www.80969a.com | 6824.com | www.7435b.com | www.7375.com | bt2088.com | www.hg7857.com | www.456586.com | mm2649.com | www.632bbb.com | 118888e.com | www.2223xj.com | www.c705.cc | 9694z.com | www.69567s.com | 2127k.com | www.jing6665.com | www.hw8889.com | 87965aa.com | www.653968.com | 9420z.com | www.22444100.com | www.763236.com | 0033r.cc | www.68993221.com | f2894.com | www.799666q.com | www.035059.com | www.hg9952.com | www.66598b.com | 67888y.cc | www.4058nn.com | 4997g.com | www.64717.com | www.464499.com | 2287.com | www.53900g.com | y8287.com | www.62979g.com | wns789.net | www.449msc.com | 7196uu.com | www.995h.net | www.978366.com | 8827www.com | www.sx1800.com | j333.cc | www.js69111.com | 7893w48.com | www.810234.com | 11422y.com | www.25288z.com | www.799200.com | 39830d.com | www.36787d.com | 25288a.com | www.4520055.com | 2757e.com | www.0096aa.com | 18438333.com | www.77731v.com | JS777.la | www.longbet168.com | www.xinyc3.com | www.995n.net | www.656650.com | www.longfa110.com | www.3991.cc | gc.cc | www.54400z.com | vip7704.cc | www.hg57977.com | 657094.com | www.7340111.com | 01860.net | www.w84g.com | q1458.com | www.115527k.com | 2505.com | www.35700bb.com | 4165r.com | www.04567c.com | 1213zzz.com | www.47727.net | 1168i.com | www.7415t.com | 10050533.com | www.9b001.com | 79889f.com | www.89599u.com | 38365h.com | www.22mgm777.com | bwinttt.com | www.3983151.com | 15856c.com | www.q32031.com | 55797p.com | www.519095.com | p8159.cc | www.68993226.com | 4182h.com | www.04088.com | 3434zzz.com | www.89939.cc | 59964mm.com | www.c6465.com | www.yddc09.com | www.562500.com | www.3056008.com | www.80767u.com | www.8422.com | 9539l.com | www.35252v.com | 90307o.com | www.47506u.com | 7599x.com |