两位数加减两位数口算题(37 页)Good is good, but better carries it
精益求精,善益求善
70-58= 97-19= 70-48= 90-18= 18+68=98-29= 41-23= 71-45= 17+14= 39+48=39+38= 41-13= 15+16= 66+19= 63-46=38+28= 78-69= 46+39= 50-21= 77-59=54-38= 62-36= 61-49= 71-35= 63-56=46+49= 23+28= 23+38= 16+26= 39+15=70-58= 18+68= 39+48= 63-46= 38+28=77-59= 63-56= 39+15= 95-69= 27+69=81-57= 56+38= 49+37= 40-18= 37+56=29+67= 90-33= 29+44= 73-45= 57+35=95-59= 48-39= 57+25= 28+57= 81-34=57+16= 96-57= 59+23= 31-19= 40-28=47-29= 16+29= 56+28= 64+27= 96-47=73-36= 81-24= 80-37= 82-44= 16+19=48+17= 87-48= 80-47= 33-17= 49+27=58+13= 27+69= 37+56= 57+35= 95-59= 69+22= 28+26= 29+23= 29+13= 15+77=35+37= 79+18= 27+38= 27+28= 53-45=27+48= 75-68= 83-67= 35+27= 60-46=95-28= 94-18= 95-38= 80-16= 36+25=74-58= 28+36= 52-25= 63+18= 36+15=90-68= 75-46= 61-33= 6