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1、,两位数加一位数（进位）,38+ =40,7+8=,9+3=,6+8=,44+ =50,55+ =60,82+ =90,25+3=,23+10=,4+12=,20+5=,20+16=,6,9个一加4个一。,3,9,10个一是1个十。,7,27+5=,7+5=12,27+5=7+5=12,20+12=32,27+5=7+5=12,32,20+12=32,27,+5,27,+5,+3,+2,30,32,25,30,27,40,35,20,+3,+2,27+5=,27+3 =30,30+2 =32,32,32,3,2,3,60,34,40,43,48,50,55,30,+6,+3,+2,+5,34+
2、9=,34+6=40,40+3=43,43,48+7=,48+2=50,50+5=55,55,6,3,2,5,38+7=,29+5=,2,5,1,4,38+2=40,40+5=45,45,34,8+7=15,30+15=45,29+1=30,30+4=34,9+5=14,20+14=34,23+8=,16+5=,6+29=,35+7=,26+6=,31,21,35,42,32,你,们,真,聪,明,28+3=19+7=,31,26,14+5=51+2=,19,53,3,2,265,31,348,42,429,51,672,69,48+4=,52,1+27=,28,36+5=,41,18+4=,2
3、2,33+8=,41,15+9=,24,46+3=,49,28+6=,34,18+7=,25,6+26=,32,35+4=,39,63+8=,71,69+3=,72,35+7=,42,47+6=,53,25+4=,29,16+2=,18,9+44=,53,18+7=,25,39+6=,45,5,7个一减9个一。,7,1个十是10个一。,4,8,57-9=,48,5,4,57,-9,40,48,17,8,57,-9,47,48,10,1,23-8=45-6=,15,39,28-6=59-4=,22,55,1,2,25-6,19,34-8,26,42-9,33,67-2,65,44-7=,37,91-5=,86,36-5=,31,51-4=,47,33-8=,25,72-7=,65,43-4=,39,26-7=,19,43-7=,36,65-9=,56,54-5=,49,63-7=,56,63-6=,57,35-7=,28,74-6=,68,25-4=,21,36+7=,43,9+47=,53,67-8=,59,36-9=,27,
