小学数学人教一年级摆一摆想一 想.ppt

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,*,摆一摆,想一想,十位,个位,组成的数,3,12,21,30,十位,个位,组成的数,30,21,12,3,圆片个数,摆的个数,摆出的数,1,2,3,4,5,6,7,8,9,1,、,10,2,、,11,、,20,3,、,12,、,21,、,30,2,3,4,十 位,个 位,表示的数,4,13,22,31,40,4,个 可以摆成：,十 位,个 位,表示的数,5,14,23,32,41,5,个 可以摆成：,50,圆片个数,摆的个数,摆出的数,1,2,3,4,5,6,7,8,9,1,、,10,2,、,11,、,20,3,、,12,、,21,、,30,4,、,13,、,22,、,31,、,40,5,、,14,、,23,、,32,、,41,、,50,2,3,4,5,6,6,颗棋子可以摆出下面这些数字吗,?,6,、,24,、,15,、,34,、,42,、,51,、,33,、,60,34,7,圆片个数,摆的个数,摆出的数,1,2,3,4,5,6,7,8,9,1,、,10,2,、,11,、,20,3,、,12,、,21,、,30,4,、,13,、,22,、,31,、,40,5,、,14,、,23,、,32,、,41,、,50,6,、,15,、,24,、,33,、,42,、,51,、,60,2,3,4,5,6,7,圆片个数,数的个数,摆出的数,2,5,1,2,3,4,5,6,1,、,10,2,、,11,、,20,3,、,12,、,21,、,30,4,、,13,、,22,、,31,、,40,5,、,14,、,23,、,32,、,41,、,50,6,、,15,、,24,、,33,、,42,、,51,、,60,3,4,6,7,观察上表,你发现了什么,?,摆出的,数的个数,比,圆片的个数,多,1,个,.,十位,和,个位,上的数字,相加,等于,圆片的个数,圆的个数,摆的个数,摆出的数,1,2,3,4,5,6,7,8,9,2,3,4,5,6,7,8,9,10,1,、,10,2,、,11,、,20,3,、,12,、,21,、,30,4,、,13,、,22,、,31,、,40,5,、,14,、,23,、,32,、,41,、,50,6,、,15,、,24,、,33,、,42,、,51,、,60,7,、,16,、,25,、,34,、,43,、,52,、,61,、,70,8,、,17,、,26,、,35,、,44,、,53,、,62,、,71,、,80,9,、,18,、,27,、,36,、,45,、,54,、,63,、,72,、,81,、,90,不用摆,你能说出,7,个圆片、,8,个圆片、,9,个圆片摆出的数吗,?,圆片个数,数的个数,摆出的数,1,2,2,3,3,4,5,6,7,8,9,4,5,6,7,8,9,10,1,、,10,2,、,11,、,20,3,、,12,、,21,、,30,4,、,13,、,22,、,31,、,40,5,、,14,、,23,、,32,、,41,、,50,6,、,15,、,24,、,33,、,42,、,51,、,60,7,、,16,、,25,、,34,、,43,、,52,、,61,、,70,8,、,17,、,26,、,35,、,44,、,53,、,62,、,71,、,80,9,、,18,、,27,、,36,、,45,、,54,、,63,、,72,、,81,、,90,7,、,16,、,34,、,43,、,52,、,61,、,70,这几个数是由几个圆片摆出来的？,7,、,16,34,、,43,、,52,、,61,、,70,。,7,7,7,7,7,7,7,个圆片,14,老师今年的年龄正好可以用,6,个圆片来表示。你们猜：老师今年的年龄可能是多少岁？,老师今年的年龄，十位上的数比个位上的数大,2,，老师今年多少岁？,哈哈！老师今年是,42,岁,。,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,用,1,个摆,用,2,个摆,用,3,个摆,用,4,个摆,用,5,个摆,用,6,个摆,用,7,个摆,用,8,个摆,用,9,个摆,奇妙的数,今天我们学了一个什么游戏呀,?,摆一摆,想一想,说说你这节课有什么收获,?,摆数时,先把所有的圆片都摆在,个位上,然后,依次,从个位拿出一个圆片摆在,十位上,摆一个记一个,直到所有的圆片都摆在十位上,.,规律,:,摆出的,数的个数,比所使用的,圆的个数,多,1,个,.,十位,和,个位,上的数,相加,等于,圆的个数,