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# 2. Algebraic expressions

Algebraic expressions are the idea of expressing numbers using letters or alphabets without specifying their actual values. The basics of algebra taught us how to express an unknown value using letters such as x, y, z, etc. These letters are called here as variables. An algebraic expression can be a combination of both variables and constants. Any value that is placed before and multiplied by a variable is a coefficient.

Negative numbers: Foundations

Absolute value: Foundations

Exponents: Foundations

Square roots: Foundations

Order of operations: Foundations

Fractions: Foundations

Decimals, fractions and percentages: Foundations

Operations with decimals: Foundations

Area of triangles: Foundations

Circumference and area of circles

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