1, the addition formula: one up five to four, one up nine to one, two up two, two down five to three, two up eight to one, three up three, three up five to two, three up seven to one, four up four, four down five to one, five up five, five up five to one, six up six.

2, subtraction formula: one down, one up, four to fifty percent, one back to nine; Two drops two, two rises three to five, and two retreats one to eight; Three times three, three times two to five, three times one to seven; Four down four, four up one to five, four back one to six; Five down five, five back to five; Six to six, six to one to four, six to one to five to one; Seven to seven, seven to one to three, seven to one to five to two; Eight down eight, eight back to one two, eight back to one five three; Nine to nine, nine to one, nine to one, five to four.