Modulo Examples

Let me show you several examples:

$\bullet$ $10 \bmod 3 = 1$ (because $10 = 3 \times 3 + 1$)

$\bullet$ $15 \bmod 4 = 3$ (because $15 = 4 \times 3 + 3$)

$\bullet$ $20 \bmod 5 = 0$ (because $20 = 5 \times 4 + 0$)

When the remainder is $0$, the first number divides evenly into the second. This is how you check if a number is divisible by another.