how do u get a remaner frome 20000 / 79?

20,000 mod 79 =13 - the remainder.

Here is the trick:

First divide them on a calculator:

20,000 / 79 = 253.164556962

Okay now get that answer and get only the decimal part:

253.164556962 ----> 0.164556962

Last step to get remainder multiply that decimal by 79:

0.164556962 x 79 = 13

BAM! 13 is your remainder!!!