Modular Arithmetic Remainder Congruency such as $98765 ^ {54321} \bmod 7$
360
Modular exponentiation by hand ($a^b\bmod c$)
156089
Why is the associative property valid for modular arithmetic?
16700
Modular reduction of fractions
30045
Solving linear congruences by hand: modular fractions and inverses
72406
Last two digits of $2^{1000}$ via Chinese Remainder Theorem?
20908
How to compute $k$'th roots $\!\bmod n$?
134654
How to apply CRT to a congruence system with moduli not coprime?
1425
The Chinese Remainder Theorem for Rings.
39969
Algorithms for computing multiplicative order modulo $n$
10105
Proving $\, a^b = (a\bmod n)^b\, \pmod{\!n}\ $ [Congruence Power Rule]
157771
Nested exponent modulus, $2^{2^{517}} \pmod {23}$
13317
show that $a^{12} \equiv 1 \mod 32760$ for each $a \in \mathbb{Z}$ such that $\text{gcd}(a, 32760) = 1$
150446
Quadratic Modular Arithmetic
111555
Find $a,b \in \mathbb{N}$ with $\mathrm{lcm}(a,b)=12\gcd(a,b)\,$ and $\,a\bmod b = 5$
58803
${n \choose k} \bmod m$ using Chinese remainder theorem?
4435
What does $\!\bmod(n,x^r-1)$ mean? [in AKS primality test]
73020
Every integer is congruent to the sum of its digits mod 9