How many single-digit numbers can be added to the number 60 so that the number in its record

How many single-digit numbers can be added to the number 60 so that the number in its record changes only in the row of units?

In this task, we will find the number of single-digit digits that satisfy the requirement of the task condition;

Each digit in the notation of a multi-digit number occupies a certain place – position. The place (position) in the record of the number on which the digit stands is called a discharge.
The digits are counted from right to left. That is, the first digit on the right in the number recording is called the first digit, the second digit on the right is the second digit, and so on.
This means that it is necessary to add such values ​​to the category of units so that the sum is a single-digit number;

0 + 0 = 0 is not suitable since the digit will not change;

0 + 1 = 1 fits;

0 + 2 = 2 fits;

0 + 3 = 3 fits;

0 + 4 = 4 fits;

0 + 5 = 5 fits;

0 + 6 = 6 fits;

0 + 7 = 7 fits;

0 + 8 = 8 fits;

0 + 9 = 9 fits;

Answer: You can add 9 digits.