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,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,整十数加、减整十数,苏教版一年级数学下册,你能提出一个加法问题吗？,和,一共有多少个座位,?,40 + 30 =,40 + 30 =,？,下一步,4030,?,70,十个十个地数,40,50,60,70。,返回,4个十,加,得,7个十,4030,?,3个十,70,返回,4030,?,0,0,4,0,3,7,437,返回,20,50,60,70,40,30,做加法,试一试，你准行！,50,60,70,80,90,70 30 =,?,7个十,减,得,4个十,70,3,0,？,3个十,40,70,3,0,？,0,0,7,0,3,4,也可以这样算：,80,50,60,70,40,30,做减法,试一试，你准行！,50,40,30,20,10,我们一起去钓鱼吧！,“钓鱼的路上会遇到很多难题。因此，我要先考考你。“,+ =,+ =,- =,- =,50,40,90,40,50,90,90,40,50,90,50,40,50-10=,考考你的眼力,3+2 =,5,4,9,50,40,90,2+3+4=,20+30+40=,5-1=,30+20=,9-3+2 =,90-30+20 =,8,80,60,-10,+30,-70,40,+60,80,40,+20,-50,+30,+6,50,80,10,70,30,40,60,10,40,46,“谢谢同学们帮助花花！这么多难题都没有难住你们。,花花邀请你们和它一起去钓鱼。,希望你们能钓到许多许多的鱼！不过，,你们可要牢牢的记住，只有得数等于,40,的路，才是回家的路！”,90,80,30,50,80,40,30+70-40=,60,80-50+7=,37,40,20,+,30,100,60,30,0,0,+,40,40,10,90,50,30,+,10,70,20,50,10,20+30,70,30,40+30,10+30,60,40,50,+,20,90,60,将,10,、,20,、,30,、,40,、,50,填在圆圈里，使每条直线上的三个数的和相等。,40,30,20,10,50,50,20,10,40,30,30,50,10,20,40,20 + 20 = 40,40,50,70,80,20+20,10+60,70-20,60+20,10+40,20+60,90-10,70-30,90-50,90-20,100-50,
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