8 8、9 9的组成及加的组成及加减法减法8个 分成两堆，有几种分法？8718177 + 1 =81 + 7 =8或或8 7 =18 1 =7或或8628266 + 2 =82 + 6 =8或或8 6 =28 2 =6或或8538535 + 3 =83 + 5 =8或或8 5 =38 3 =5或或8444 + 4 =88 4 =4817826835844853862871354482681788填一填填一填=6282688583359个 分成两堆，有几种分法？9819188 + 1 =91 + 8 =9或或9 8 =19 1 =8或或9729277 + 2 =92 + 7 =或或99 7 = 29 2 =或或79639366 +3 = 93+ 6 =或或99 6 = 39 3 =或或69549455 +4 = 94+ 5 =或或99 5 = 49 4 =或或591892793694595496397298185141326796478352填上合适的数填上合适的数2+4= 1+5= 6-1= 2+2= 3+2= 4+3= 6-3= 7-2=看谁算得快！看谁算得快！图上画着什么？图上画着什么？图上画着什么？图上画着什么？你能写出那些算你能写出那些算你能写出那些算你能写出那些算式？式？式？式？6 + 2 = 86 + 2 = 82 + 6 = 82 + 6 = 88 - 2 = 68 - 2 = 68 - 6 = 28 - 6 = 2摆一摆摆一摆摆一摆摆一摆7 + 2 =7 + 2 =2 + 7 =2 + 7 =999 9 2 = 2 =9 9 7 = 7 =72算一算算一算5 + 3 =5 + 3 =8 8 3 = 3 =853 + 5 =3 + 5 =8 8 5 = 5 =835+3=8，3+5就就一定等于一定等于8吗吗？5+3=3+5=85+3=3+5=87 + 1 = 88 7 =17+1=87+1=8，8-7=18-7=16 + 2 = 88 6 =8 2 =5 + 4 = 99 5 =9 4 =2645+=9 2 =7 + 2 = 97279972哪两张卡片上的数相加得哪两张卡片上的数相加得哪两张卡片上的数相加得哪两张卡片上的数相加得8 8？哪两张卡？哪两张卡？哪两张卡？哪两张卡片上的数相加得片上的数相加得片上的数相加得片上的数相加得9 9？5+2=74+1=54+3=74+2=63+5=84+4=86+3=9你会吗？你会吗？谢谢大家的配合！谢谢大家的配合！