第第頁2.十幾減8、7、6第1課時十幾減8、7、6(1)知識演練場1EQ\*jc0\*hps12\o(\s\up11(kě),可)EQ\*jc0\*hps12\o(\s\up11(yǐ),以)EQ\*jc0\*hps12\o(\s\up11(zěn),怎)EQ\*jc0\*hps12\o(\s\up11(yàng),樣)EQ\*jc0\*hps12\o(\s\up11(jì),計)EQ\*jc0\*hps12\o(\s\up11(suàn),算)13—8?EQ\*jc0\*hps12\o(\s\up11(àn),按)EQ\*jc0\*hps12\o(\s\up11(yāo),要)EQ\*jc0\*hps12\o(\s\up11(qiú),求)EQ\*jc0\*hps12\o(\s\up11(zuò),做)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(zuò),做),EQ\*jc0\*hps12\o(\s\up11(suàn),算)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(suàn),算)。(1)先圈一圈，再算一算。(2)先畫一畫，再算一算。13-8=2EQ\*jc0\*hps12\o(\s\up11(bǐ),比)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(bǐ),比),EQ\*jc0\*hps12\o(\s\up11(suàn),算)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(suàn),算)。8+□=17 6+□=12 6+□=1117-8=□ 12-6=□ 11-6=□還剩幾個沙包沒投?33□○□=□(個)智慧加油站4EQ\*jc0\*hps12\o(\s\up11(tóng),同)EQ\*jc0\*hps12\o(\s\up11(xué),學)EQ\*jc0\*hps12\o(\s\up11(men),們)EQ\*jc0\*hps12\o(\s\up11(zhàn),站)EQ\*jc0\*hps12\o(\s\up11(chéng),成)EQ\*jc0\*hps12\o(\s\up11(yì),一)EQ\*jc0\*hps12\o(\s\up11(pái),排),EQ\*jc0\*hps12\o(\s\up11(cóng),從)EQ\*jc0\*hps12\o(\s\up11(zuǒ),左)EQ\*jc0\*hps12\o(\s\up11(wǎng),往)EQ\*jc0\*hps12\o(\s\up11(yòu),右)EQ\*jc0\*hps12\o(\s\up11(bào),報)EQ\*jc0\*hps12\o(\s\up11(shù),數(shù)),EQ\*jc0\*hps12\o(\s\up11(xiǎo),小)EQ\*jc0\*hps12\o(\s\up11(jūn),軍)EQ\*jc0\*hps12\o(\s\up11(bào),報)EQ\*jc0\*hps12\o(\s\up11(de),的)EQ\*jc0\*hps12\o(\s\up11(shì),是)8,EQ\*jc0\*hps12\o(\s\up11(xiǎo),小)EQ\*jc0\*hps12\o(\s\up11(líng),玲)EQ\*jc0\*hps12\o(\s\up11(bào),報)EQ\*jc0\*hps12\o(\s\up11(de),的)EQ\*jc0\*hps12\o(\s\up11(shì),是)16。EQ\*jc0\*hps12\o(\s\up11(xiǎo),小)EQ\*jc0\*hps12\o(\s\up11(jūn),軍)EQ\*jc0\*hps12\o(\s\up11(hé),和)EQ\*jc0\*hps12\o(\s\up11(xiǎo),小)EQ\*jc0\*hps12\o(\s\up11(líng),玲)EQ\*jc0\*hps12\o(\s\up11(zhī),之)EQ\*jc0\*hps12\o(\s\up11(jiān),間)EQ\*jc0\*hps12\o(\s\up11(yǒu),有)EQ\*jc0\*hps12\o(\s\up11(duō),多)EQ\*jc0\*hps12\o(\s\up11(shao),少)EQ\*jc0\*hps12\o(\s\up11(rén),人)?畫一畫：算一算:□○□○□=□(人)第2課時十幾減8、7、6(2) 知識演練場1□+□=□□-□=□□-□=□2EQ\*jc0\*hps12\o(\s\up11(xiāng),相)EQ\*jc0\*hps12\o(\s\up11(tóng),同)EQ\*jc0\*hps12\o(\s\up11(yán),顏)EQ\*jc0\*hps12\o(\s\up11(sè),色)EQ\*jc0\*hps12\o(\s\up11(de),的)EQ\*jc0\*hps12\o(\s\up11(kǎ),卡)EQ\*jc0\*hps12\o(\s\up11(piàn),片)EQ\*jc0\*hps12\o(\s\up11(dé),得)EQ\*jc0\*hps12\o(\s\up11(shù),數(shù))EQ\*jc0\*hps12\o(\s\up11(xiāng),相)EQ\*jc0\*hps12\o(\s\up11(tóng),同)，EQ\*jc0\*hps12\o(\s\up11(qǐng),請)EQ\*jc0\*hps12\o(\s\up11(tián),填)EQ\*jc0\*hps12\o(\s\up11(chū),出)?EQ\*jc0\*hps12\o(\s\up11(lǐ),里)EQ\*jc0\*hps12\o(\s\up11(de),的)EQ\*jc0\*hps12\o(\s\up11(shù),數(shù))。3EQ\*jc0\*hps12\o(\s\up11(quān),圈)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(quān),圈),EQ\*jc0\*hps12\o(\s\up11(suàn),算)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(suàn),算),EQ\*jc0\*hps12\o(\s\up11(nǐ),你)EQ\*jc0\*hps12\o(\s\up11(yǒu),有)EQ\*jc0\*hps12\o(\s\up11(shén),什)EQ\*jc0\*hps12\o(\s\up11(me),么)EQ\*jc0\*hps12\o(\s\up11(fā),發(fā))EQ\*jc0\*hps12\o(\s\up11(xiàn),現(xiàn))?11-8=2+□=□12-8=2+□=□13-8=2+□=□試著再寫出兩組:□-8=2+□=□ □-8=2+□=□4EQ\*jc0\*hps12\o(\s\up11(gǔ),古)EQ\*jc0\*hps12\o(\s\up11(shí),時)EQ\*jc0\*hps12\o(\s\up11(hou),候)，EQ\*jc0\*hps12\o(\s\up11(rén),人)EQ\*jc0\*hps12\o(\s\up11(men),們)EQ\*jc0\*hps12\o(\s\up11(yòng),用)EQ\*jc0\*hps12\o(\s\up11(zài),在)EQ\*jc0\*hps12\o(\s\up11(shéng),繩)EQ\*jc0\*hps12\o(\s\up11(zi),子)EQ\*jc0\*hps12\o(\s\up11(shàng),上)EQ\*jc0\*hps12\o(\s\up11(dǎ),打)EQ\*jc0\*hps12\o(\s\up11(jié),結)EQ\*jc0\*hps12\o(\s\up11(de),的)EQ\*jc0\*hps12\o(\s\up11(fāng),方)EQ\*jc0\*hps12\o(\s\up11(fǎ),法)EQ\*jc0\*hps12\o(\s\up11(jì),記)EQ\*jc0\*hps12\o(\s\up11(lù),錄)EQ\*jc0\*hps12\o(\s\up11(liè),獵)EQ\*jc0\*hps12\o(\s\up11(wù),物)EQ\*jc0\*hps12\o(\s\up11(shù),數(shù))EQ\*jc0\*hps12\o(\s\up11(liàng),量)。還要打幾個結?□○□=□(個)智慧加油站5“?”EQ\*jc0\*hps12\o(\s\up11(chù),處)EQ\*jc0\*hps12\o(\s\up11(fàng),放)()EQ\*jc0\*hps12\o(\s\up11(gè),個)□EQ\*jc0\*hps12\o(\s\up11(tiān),天)EQ\*jc0\*hps12\o(\s\up11(píng),平)EQ\*jc0\*hps12\o(\s\up11(cái),才)EQ\*jc0\*hps12\o(\s\up11(néng),能)EQ\*jc0\*hps12\o(\s\up11(bǎo),保)EQ\*jc0\*hps12\o(\s\up11(chí),持)EQ\*jc0\*hps12\o(\s\up11(píng),平)EQ\*jc0\*hps12\o(\s\up11(héng),衡)。兩端一樣重才能使天平平衡。3.十幾減5、4、3、2十幾減5、4、3、2知識演練場1EQ\*jc0\*hps12\o(\s\up11(bīng),冰)EQ\*jc0\*hps12\o(\s\up11(shàng),上)EQ\*jc0\*hps12\o(\s\up11(hái),還)EQ\*jc0\*hps12\o(\s\up11(shèng),剩)EQ\*jc0\*hps12\o(\s\up11(jǐ),幾)EQ\*jc0\*hps12\o(\s\up11(zhī),只)EQ\*jc0\*hps12\o(\s\up11(qǐ),企)EQ\*jc0\*hps12\o(\s\up11(é),鵝)?EQ\*jc0\*hps12\o(\s\up11(tián),填)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(tián),填)。12-3=□(只)12 □+3=12 13-3=□? 12-3=□ 12-3=□2EQ\*jc0\*hps12\o(\s\up11(xiǎo),小)EQ\*jc0\*hps12\o(\s\up11(kē),蝌)EQ\*jc0\*hps12\o(\s\up11(dǒu),蚪)EQ\*jc0\*hps12\o(\s\up11(zhǎo),找)EQ\*jc0\*hps12\o(\s\up11(mā),媽)媽。(EQ\*jc0\*hps12\o(\s\up11(lián),連)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(ma),連))13-5 13-6 11-3 14-5( 11-2 12-43EQ\*jc0\*hps12\o(\s\up11(yáng),陽)EQ\*jc0\*hps12\o(\s\up11(guāng),光)EQ\*jc0\*hps12\o(\s\up11(xiǎo),小)EQ\*jc0\*hps12\o(\s\up11(xué),學)EQ\*jc0\*hps12\o(\s\up11(zài),在)EQ\*jc0\*hps12\o(\s\up11(zhí),植)EQ\*jc0\*hps12\o(\s\up11(shù),樹)EQ\*jc0\*hps12\o(\s\up11(jié),節(jié))EQ\*jc0\*hps12\o(\s\up11(kāi),開)EQ\*jc0\*hps12\o(\s\up11(zhǎn),展)EQ\*jc0\*hps12\o(\s\up11(zhí),植)EQ\*jc0\*hps12\o(\s\up11(shù),樹)EQ\*jc0\*hps12\o(\s\up11(huó),活)EQ\*jc0\*hps12\o(\s\up11(dòng),動)，EQ\*jc0\*hps12\o(\s\up11(dì),第)EQ\*jc0\*hps12\o(\s\up11(yī),一)EQ\*jc0\*hps12\o(\s\up11(xiǎo),小)EQ\*jc0\*hps12\o(\s\up11(zǔ),組)EQ\*jc0\*hps12\o(\s\up11(zhèng),正)EQ\*jc0\*hps12\o(\s\up11(zài),在)EQ\*jc0\*hps12\o(\s\up11(zhí),植)EQ\*jc0\*hps12\o(\s\up11(shù),樹)。(1)□○□=□(人)(2)第一小組要種13棵樹，已經(jīng)種了4棵，還要種多少棵?□○□=□(棵)智慧加油站4EQ\*jc0\*hps12\o(\s\up11(yǒu),有)EQ\*jc0\*hps12\o(\s\up11(qù),趣)EQ\*jc0\*hps12\o(\s\up11(de),的)EQ\*jc0\*hps12\o(\s\up11(yóu),游)EQ\*jc0\*hps12\o(\s\up11(xì),戲)。(EQ\*jc0\*hps12\o(\s\up11(yí),移)EQ\*jc0\*hps12\o(\s\up11(dòng),動)EQ\*jc0\*hps12\o(\s\up11(yì),一)EQ\*jc0\*hps12\o(\s\up11(gēn),根)EQ\*jc0\*hps12\o(\s\up11(xiǎo),小)EQ\*jc0\*hps12\o(\s\up11(bàng),棒)，EQ\*jc0\*hps12\o(\s\up11(shǐ),使)EQ\*jc0\*hps12\o(\s\up11(suàn),算)EQ\*jc0\*hps12\o(\s\up11(shì),式)EQ\*jc0\*hps12\o(\s\up11(chéng),成)EQ\*jc0\*hps12\o(\s\up11(lì),立))練習一 知識演練場1□○□=□(個) □○□=□(只)2EQ\*jc0\*hps12\o(\s\up11(suàn),算)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(suàn),算),EQ\*jc0\*hps12\o(\s\up11(bǐ),比)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(bǐ),比)。10-7+4= 10-9+3= 15-5-1= 13-3-2=14-7= 13-9= 15-6= 13-5=3EQ\*jc0\*hps12\o(\s\up11(xiān),先)EQ\*jc0\*hps12\o(\s\up11(suàn),算)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(suàn),算),EQ\*jc0\*hps12\o(\s\up11(zài),再)EQ\*jc0\*hps12\o(\s\up11(shuō),說)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(shuō),說)EQ\*jc0\*hps12\o(\s\up11(nǐ),你)EQ\*jc0\*hps12\o(\s\up11(fā),發(fā))EQ\*jc0\*hps12\o(\s\up11(xiàn),現(xiàn))EQ\*jc0\*hps12\o(\s\up11(le),了)EQ\*jc0\*hps12\o(\s\up11(shén),什)EQ\*jc0\*hps12\o(\s\up11(me),么)。4(1)下面計算12—5的方法中，正確的有哪些?在□里畫“?”。10-5=511-5=612-5=7(2)下面哪些問題可以用12—5解決?在□里畫“?”。12個蘋果，紅蘋果有5個，其余的是綠蘋果，綠蘋果有幾個?12個蘋果，吃掉了5個，還剩幾個?一筐蘋果，先吃了12個，又吃了5個，一共吃了多少個?5EQ\*jc0\*hps12\o(\s\up11(suàn),算)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(suàn),算)，EQ\*jc0\*hps12\o(\s\up11(tián),填)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(tián),填)。按照發(fā)現(xiàn)的規(guī)律填一填：17-8=□-□=□-□=□-□6解決問題。(1)還有幾個小動物？十二生肖。(2)媽媽包了16個包子，每個籠屜裝7個包子，裝了一籠后，剩下的包子還能再裝滿一籠嗎？□○□=□(個)□○□能□不能 □(畫“?”)智慧加油站7EQ\*jc0\*hps12\o(\s\up11(àn),按)EQ\*jc0\*hps12\o(\s\up11(yāo),要)EQ\*jc0\*hps12\o(\s\up11(qiú),求)EQ\*jc0\*hps12\o(\s\up11(tián),填)EQ\*jc0\*hps12\o(\s\up11(yi),一)EQ\*jc0\*hps12\o(\s\up11(tián),填)。(1)在□里填上合適的數(shù)。 □-4=8 11-□=4(2)□里最小能填多少？ □-4>8 11-□<4(3)□最大能填多少？ □-4<8 11-□>4第一章20以內(nèi)的退位減法參考答案1.十幾減9第1課時十幾減9(1)1.9+5=1414-9=[52.(豎排)15 6 167178 189我發(fā)現(xiàn)一個加數(shù)不變，另一個加數(shù)增加1，和也增加1。(發(fā)現(xiàn)合理即可)3.13-9=411-9=24.12-9=35.17-6=1111-9=2解析根據(jù)式子△+6=17可以得到△=17-6=11,而9+?=11,所以?=11-9=2。第2課時十幾減9(2)1.②2.3.23456789我發(fā)現(xiàn)，減數(shù)不變，被減數(shù)增加1，差也增加1。(發(fā)現(xiàn)合理即可)4.14-9=55.17-9解析根據(jù)題意可知，算錯的答案是3，比正確的答案少5，所以正確的答案是8,即1□-9=8。被減數(shù)為8+9=17,正確的算式為17-9。2.十幾減8、7、6第1課時十幾減8、7、6(1)1.(1)(圈法不唯一)(2)(畫法