## Math Basics## More About Numbers |

## What is congruence? |

In reference to numbers, congruence is the property of two integers having the same remainder upon division by another integer. The term also is often used in geometry to describe a property of geometric formations (for more information about congruence in geometry, see “Geometry and Trigonometry”). Still another way of using congruence is in number theory, in which modular arithmetic is the arithmetic of congruences, which is sometimes informally called “clock arithmetic.”