Abacus

Absolute Error

Absolute Value Function

Absolute Value of a Real Number

Absorbing Element

Abundant Number

Adding Fractions

Addition

Addition Equation

Addition Of Irrational Numbers

Addition of Rational Numbers

Addition of Real Numbers

Additive Inverse

Algebraic Measure

Algebraic Number

Algebraic Operation

Algorithm

Aliquant Part of an Integer

Aliquot Part of a Whole

Alphametic

Amicable Numbers

Amortization

Amplitude of an Interval

Annuities

Approximate Value

Approximation

Approximation by Estimation

Approximation by Rounding

Approximation by Truncation

Arabic Numeral

Archimedes of Syracuse (c. 287- c. 212 BCE)

Arithmetic

Arithmetic Progression

Arithmetic Sequence

Arrangement

Aryabhata (476 – 550)

As Much

Ascending Order

Associative Operation

Base Element

Base of a Logarithm

Base of a Number System

Base of a Power

Base of an Exponentiation

Billion

Binary Numeral System

Binary Operation

Borrowing

Bound

Cardinal of a Set

Cardinality

Carl Friedrich Gauss (1777-1855)

Centre

Certain Digit

Characteristic

Christian Goldbach (1690-1764)

Christian Kramp (1760-1826)

Christoff Rudolff (1499-1545)

Christopher Clavius (1538-1612)

Claudius Ptolemy (C. 85 – C. 165)

Coefficient of Proportionality

Combination

Common Denominator

Common Logarithm of a Number

Commutative Operation

Comparison

Complex Fraction

Composite Number

Compound Interest

Congruence of Numbers

Congruent Numbers Modulo N

Consecutive

Consecutive Whole Numbers

Constant

Constant Term

Constraint

Corresponding

Cost Price

Countable Set

Counting

Criterion

Cryptarithm

Cube

Cube Number

Cube of a Number

Cube Root of a Real Number

Decimal Expansion of a Number

Decimal Fraction

Decimal Notation

Decimal Number

Decimal Number System

Decimal Numeral System

Decimal Part of a Real Number

Decimal Place

Decimal Point

Decimal Sequence

Decomposition

Decomposition of a Number

Decreasing Sequence

Deficient Number