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1、两位数加两位数(不进位,一年级数学第二册,37+12=,37+12=,37+12,30+10=40,7+2=9,40+9=49,49,37+12=,37+12,37+10=47,47+2=49,49,37+12=,37+12,30+12=42,42+7=49,49,37+12=49 30+10=40 7+2=9 40+9=49,37+12=49 37+10=47 47+2=49,37+12=49 30+12=42 42+7=49h,两位数加两位数(不进位,一双 42元,一辆 37元,42+37,1,42+37,40+30=70,2+7=9,70+9=79,79,42+37,2,42+30=72
2、,72+7=79,79,42+37,40+37=77,79,3,77+2=79,一条 22元,一件 41元,22+41,1,22+41,20+40=60,2+1=3,60+3=63,63,22+41,2,22+40=62,62+1=63,63,22+41,20+41=61,63,3,61+2=63,一只 21元,一条 22元,21+22,20+20=40,1+2=3,40+3=43,43,21+22,21+20=41,41+2=43,43,21+22,20+22=42,43,42+1=43,21+22,1,2,3,一辆 37元,一只 21元,37+21,37+21,30+20=50,7+1=8,50+8=58,58,37+21,37+20=57,57+1=58,58,37+21,30+21=51,51+7=58,58
