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Math Dictionary
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Found 20 Terms

abacus
a device for calculating; can use beads or counters.

acute
describes an angle between 0° and 90°.

any number which is to be added: 2 + 5 = 7 (2 and 5 are addends).

adjoining (as used to describe lines and angles).

Angles which have the same vertex and a line in common are called adjacent angles.

algorithm
A procedure or formula for solving a problem. The word derives from the name of the mathematician, Mohammed ibn-Musa Al-Khowarizmi, who was part of the royal court in Baghdad and who lived from about 780 to 850.

alternate
every other one in a sequence.

altitude of a triangle
The line drawn from a vertex of a triangle to meet the opposite site at right angles.

analog clock
A clock face with numbers 1 to 12 and two hands

angle
the number of degrees rotated around a point.

apex
The highest point where two or more lines meet to form a corner of a figure or solid.

aproximation
A result that is almost accurate. Rounding to the next highest whole number is an approximation

arbitrary units
non-standard units such as hand spans, counters and hand claps.

arc
part of the circumference of a circle.

area
the amount of space within a perimeter (expressed in square units).

array
the arrangement of the units of a number in rows and columns (e.g., 6 = :::).

ascending order
the arrangement of numbers from smallest to largest.

associative
An operation is associative if when three elements are combined it does not matter how the brackets are placed. Ex: (x*y)*z=x*(y*z).

average
a number representing a set of numbers (obtained by dividing the total of the numbers by the number of numbers in the set). See "mean".

axis (of symmetry)
a line dividing a shape into two symmetrical parts.