# Elementary english abc

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Read the instructions and have fun playing and practising English. Courses Find a face-to-face or online course near you. The United Kingdom’s international organisation for cultural relations and educational opportunities. Please forward this error screen to 158. Elementary algebra encompasses some of the basic concepts of algebra, one of the main branches of mathematics. It is typically taught to secondary school students and builds on their understanding of arithmetic. The use of variables to denote quantities allows general relationships between quantities to be formally and concisely expressed, and thus enables solving a broader scope of problems.

Many quantitative relationships in science and mathematics are expressed as algebraic equations. Algebraic notation describes how algebra is written. It follows certain rules and conventions, and has its own terminology. A term is an addend or a summand, a group of coefficients, variables, constants and exponents that may be separated from the other terms by the plus and minus operators.

They are usually written in italics. Other types of notation are used in algebraic expressions when the required formatting is not available, or can not be implied, such as where only letters and symbols are available. For example, exponents are usually formatted using superscripts, e. Example of variables showing the relationship between a circle’s diameter and its circumference. This is useful for several reasons.

Variables may represent numbers whose values are not yet known. Variables allow one to describe general problems, without specifying the values of the quantities that are involved. Variables allow one to describe mathematical relationships between quantities that may vary. Variables allow one to describe some mathematical properties. For example, a basic property of addition is commutativity which states that the order of numbers being added together does not matter.