10 internal addition formula table
1+ 1=2, 1+2=3,2+ 1=3, 1+3=4,2+2=4,3+ 1=4, 1+4=5,2+3=5,3+2=5,4+ 1=5, 1+5=6,2+4=6,3+3=6, 4+2=6,5+ 1=6, 1+6=7,2+5=7,3+4=7,4+3=7,5+2=7,6+ 1=7, 1+7=8,2+6=8,3+5=8,4+4=8,5+3=8,6+2=8,7+ 1=8, 1+8=9, 2+7=9,3+6=9,4+5=9,5+4=9,6+3=9,7+2=9, 8+ 1=9, 1+9= 10,2+8= 10,3+7= 10,4+6= 10,5+5= 10,6+4= 10, 7+3= 10,8+2= 10,9+ 1= 10。
Subtraction formula table within 10
10- 1=9, 10-2=8,9- 1=8, 10-3=7,9-2=7,8- 1=7, 10-4=6,9-3=6,8-2=6,7- 1=6, 10-5=5,9-4=5, 8-3=5,7-2=5, 6- 1=5, 10-6=4,9-5=4,8-4=4,7-3=4,6-2=4,5- 1=4, 10-7=3,9-6=3,8-5=3,7-4=3,6-3=3,5-2=3,4- 1=3, 10-8=2,9-7=2,8-6=2,7-5=2, 6-4=2,5-3=2,4-2=2,3- 1=2, 10-9= 1,9-8= 1,8-7= 1,7-6= 1,6-5= 1, 5-4= 1,4-3= 1,3-2= 1,2- 1= 1。
20-bit decimal addition formula table
9+2= 1 1,9+3= 12,8+3= 1 1,9+4= 13,8+4= 12,7+4= 1 1,9+5= 14,8+5= 13, 7+5= 12, 6+5= 1 1,9+6= 15,8+6= 14,7+6= 13,6+6= 12,5+6= 1 1,9+7= 16, 8+7= 15,7+7= 14,6+7= 13, 5+7= 12,4+7= 1 1,9+8= 17,8+8= 16,7+8= 15,6+8= 14, 5+8= 13,4+8= 12,3+8= 1 1,9+9= 18, 8+9= 17,7+9= 16,6+9= 15,5+9= 14,4+9= 13,3+9= 12,2+9= 1 1。
Subtraction formula of abdication within 20 years
1 1-9=2, 1 1-8=3, 1 1-7=4, 1 1-6=5, 1 1-5=6, 1 1-4=7, 1 1-3=8, 1 1-2=9, 12-9=3, 12-8=4, 12-7=5, 12-6=6, 12-5=7, 12-4=8, 12-3=9, 13-9=4, 13-8=5, 13-7=6, 13-6=7, 13-5=8, 13-4=9, 14-9=5, 14-8=6, 14-7=7, 14-6=8, 14-5=9, 15-9=6, 15-8=7, 15-7=8, 15-6=9, 16-9=7, 16-8=8, 16-7=9, 17-9=8, 17-8=9, 18-9=9。