1,不进位加法 1+0= 11+1= 21+2 = 31+3= 41+4= 51+5= 61+6= 71+7= 81+8= 52+5= 62+6= 72+7= 2+0= 12+1= 22+2= 32+3= 42+4= 1+0= 11+1= 21+2= 31+3= 41+4= 51+5= 61+6= 71+7= 81+8= 52+5= 62+6= 72+7= 2+0= 12+1= 22+2= 32+3= 42+4= 25+14= 88+1= 2,进位加法 9+1= 19+2= 29+3= 39+4= 49+5= 59+6= 69+7= 79+8= 89+9= 99+1= 78+8= 88+9= 18+2= 28+3= 38+4= 48+5= 58+6= 68+7= 9+1= 19+2= 29+3= 39+4= 49+5= 59+6= 69+7= 79+8= 89+9= 99+1= 78+8= 88+9= 18+2= 28+3= 38+4= 48+5= 58+6= 68+7= 3,不退位减法 9-1= 19-2= 29-3= 39-4= 49-5= 59-6= 69-7= 79-4= 89-5= 58-26= 68-3= 78-2= 8-1= 18-2= 28-3= 38-4= 48-2= 9-1= 19-2= 29-3= 39-4= 49-5= 59-6= 69-7= 79-4= 89-5= 58-26= 68-3= 78-2= 8-1= 18-2= 28-3= 38-4= 48-2= 96-3= 87-6= 4,退位减法 11-2= 21-2= 31-3= 41-4= 51-5= 61-6= 71-7= 81-8= 91-9= 82-8= 92-9= 12-3= 32-3= 42-4= 52-5= 62-6= 72-7= 12-7= 16-7= 11-7= 13-7= 15-7= 6+7= 11-8= 15-8= 14-8= 11-9= 17-7= 13-7= 4-7= 13-9= 16-7= 16-9= 12-4= 13-5= 13-4= 7+8= 12-7= 13-6= 12-9= 15-7= 15-6= 15-6= 16-8= 11-3= 13-4= 7+6= 59-50= 23-3= 35-30= 4+60= 86-6= 28-20= 55-50= 91-1= 74-70= 8+40= 6+60= 28―20= 40+60= 60-60= 16―8= 90―70= 83―3= 99―9= 100-50= 14―5= 85-5= 92-90= 32-2= 45-40= 65-5= 80+20= 100-60= 67-60= 84-80= 54-4= 63-3= 75-70= 48-8= 79-9= 90-20= 2+4+9= 18-9+4= 14-9+6= 13-9+8= 6+8―5= 4+5+8= 20+40―30= 62-2+40= 本文来源:https://www.wddqw.com/doc/dea608fc804d2b160a4ec037.html