一年级数学8加几课件潘旋.ppt
8加几,班级:一 年 级,分一分,6 4 7 8 5 3 2 9 10,4,2,3,1,4,3,3,5,4,1,3,0,1,1,3,6,3,7,3,2,1,7,2,5,5,2,3,8,2,6,9,2,7,8 + ( )= 10,2,10,8+2+2=,12,8+2+5=,15,8+2+8=,18,8+2+6=,16,8+2+3=,13,8+2=,一共有几颗星星?,8 + 3 =,11,算一算这三个数的和是多少?,8,7,2,10,8+5=,2,3,10,13,8+4=,2,2,10,12,8+6=,2,4,10,14,8+3=,2,1,10,11,8+7=,2,5,10,15,8 + 9 = ,方法一:,方法二:,想:9 + 8 = 17,所以:8 + 9 = 17,8 + 9 = ,2,7,10,17,圈一圈,算一算,8+5=,13,想一想,8 + 5 = ,2,10,3,13,8 + 6 = ,2,4,10,14,8 + 8 = ,2,10,6,16,8+2+2= 8+2+5=,8+4= 8+7=,8+2= 8+3= 8+4=,8+5= 8+6= 8+7=,8+8= 8+9= 8+10=,12,12,15,15,10,13,16,11,14,17,12,15,18,