Answer:

 largest even

1. if you get an odd number, put an eight in the units column.

2. if you get an even number, put a nine in the tens column.

3. if you get a zero, put a nine in the tens column.

smallest even

1. if you get an odd number, add a zero in the units column.

2. if you get an even number, add a one in the tens column

3. if you get a zero, put a one in the tens column.

Step-by-step explanation: