The amount of turn between two lines around their common point (the vertex).

Area is the amount of space inside the boundary of a flat (2-dimensional) object such as a triangle or circle, or surface of a solid (3-dimensional) object.

A decimal is a fraction whose denominator is a power of ten and whose numerator is expressed by figures placed to the right of a decimal point.

Factors are what we can multiply to get the number

Multiples are what we get after multiplying the number by an integer (not a fraction).

A fraction is a numerical quantity that is not a whole number (e.g. 3/2, 0.9).

Numerical digits which are considered to have higher values than those used in everyday counting, mathematics or financial transactions are called Large Numbers.

The measurement of anything from one end to the other end is called Length.

Mass is a unit of heaviness or weight

The maximum amount that something can contain is called its Capacity.

The number you add are called addends. The number you subtract from is called the minuend. The number you subtract is called subtrahend.

Perimeter is the distance around a two-dimensional shape.

Roman numerals are defined as combinations of the letters I, V, X, L, C, D and M which are used in various orders to stand for a specific number.

Simplification is the process of replacing a mathematical expression by an equivalent one, that is simpler (usually shorter), for example. Simplification of a fraction to an irreducible fraction. Simplification of expressions, in computer algebra.

Time is the ongoing sequence of events taking place. The past, present and future. We measure time using seconds, minutes, hours, days, weeks, months and years.