4.1 Divisibility and Mod Arithm

Question 1

Equations to express the dividend a, quotient q, and remainder r.

Answer 1

a = dq + r
q = a div d
r = a mod d

Question 2

Definition of congruence

Answer 2

A is congruent to b mod m if m divides a - b.
a ≅ b (modm) iff a mod m = b mod m