Final answer:
To reach the given result of 99999-9999, borrowing in subtraction can be used. Similarly, for the values value A = 99999 and value B = 9999, the same approach can be followed.
Step-by-step explanation:
To reach the given result of 99999-9999, we can use the concept of borrowing in subtraction. Starting from the rightmost digit, we subtract 9 from 9 and get 0. Since we cannot subtract 9 from 0, we borrow 1 from the tens digit of the larger number. So, the tens digit becomes 8 and the ones digit becomes 10. Now, we subtract 9 from 10 and get 1. The result of this subtraction is 99990-9990.
Similarly, for the values, value A = 99999 and value B = 9999, we can follow the same approach. Subtracting 9 from 9, we get 0 and we borrow 1 from the tens place. The tens digit becomes 8, and the ones digit becomes 10. Subtracting 9 from 10, we get 1. Therefore, value A = 99990 and value B = 9990.