Vertical: do math and add math. 8 to 6, and what numbers should I fill in to do math problems?

Do the math.

+Mathematics

——————

Count from 8 to 6

Add a number to a number to get himself. The word "number" can only be 0, or 9+9, and then the low-order digit has a carry of 1.

When number =0, learning =3 and doing =8, the answer is

803

+ 03

——————

806

When the number is 9, learning is 8 and doing is 7.

798

+ 98

——————

896