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Congruent (modular arithmetic)

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Congruence defines modular arithmetic.

A number is congruent to $m \pmod{n}$ if it leaves a remainder of $m$ when divided by $n$. For instance, $49\equiv 4 \pmod{5}$ because $49$ leaves a remainder of $4$ when divided by $5$. ($\equiv$ is the congruent sign)

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