When you divide a number by , the remainder is the last digit. For example, with remainder .
So the last digit of is . This works for any positive integer.
Similarly, removes the last digit. If , then .
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
Remainder when dividing by 10
When you divide a number by , the remainder is the last digit. For example, with remainder .
So the last digit of is . This works for any positive integer.
Similarly, removes the last digit. If , then .