This is the X coordinate on a Cartesian graph. The Cartesian system is the one that looks like a grid full of squares.

The absolute value is the number's distance from zero on the number line. This action ignores the + or - sign of a number. |x| is the graphic used to describe the action of absolute value. Exampl [..]

Accuracy is how close a numerical measure is to its actual value.

An acute angle is an angle that has a value greater than 0 degrees but less than 90 degrees (90º). We're sure it's adorable, too.

An acute triangle is one where all three angles are acute. Acute angles have values less than 90 degrees.

To combine two or more quantities to find one quantity called a total or sum.

An addend is any number that is being added. Example: 3 + 5 + 1 = 9. 3, 5, and 1 are addends.

Addition is the mathematical operation of combining two or more numbers into a sum.

A number that when added to a given number results in a sum of zero; the opposite of a number.

Adjacent things are next to each other.