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,看数射线做加、减法,5+3,8-3,7+2,7-2,3+3,9-7,3 + 4 = 7,+,5,2,5,7,+,4,+,往右跳,5 + 3 =,8,5,0 + 3 =,3,0+8= 2+5=,4+4= 5+3= 3+3= 3+1= 7+2= 6+1= 0+4= 9+0= 5+2=,8,8,7,8,4,4,1+7=,8,9,9,6,7,7,5 - 2 = 3,5 + 2 = 7,往右跳,往左跳,-,3,5,3,2,-,-,4,6 - 4 2,看图判断做加法还是做减法？,减法,减法,加法,加法,7 - 0= 8 - 1=,9 - 5= 4- 0= 4 - 1= 6 - 6= 9 - 3= 9 - 7= 5 - 2= 7 - 2= 0 - 0=,1,7,7,4,0,3,5 - 4=,4,6,5,3,2,0,2 + 8 = 10,动脑筋,7 + 8 = 15,动脑筋,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,0,8 - 6 = 2,动脑筋,2,4,6,8,10,0,