I'm confused on quotient and reminder

Question

Like modulo and %

Answer 1

That returns the remainder of a division!
For example 10%2=0 because 10/2 =5 and there is no remainder.
Other example is 10%3=1
because 10/3=3(the integer part) so 3*3=9 and the remainder is 1

Answer 2

It's nothing but arithmetic from the 3rd grade or so.