Binary ring diagram to illustrate operators on binary numbers. The least significant bit (LSB) is the innermost ring. Black signifies 0, white signifies 1. X is the number along the top, Y is the number on the left, Q is the result
Multiplication mod 16:

Q=(A×B)%16{\displaystyle Q=\left(A\times B\right)\%16}
Own work
Inductiveload