Solving linear equations requires isolating the variable by performing inverse operations.

Area of a rectangle is calculated by multiplying length × width.

Decimals can be converted to fractions by recognizing place values (e.g., 0.75 = 75/100).

Discounts are calculated by multiplying the original price by the discount percentage, then subtracting from the original.

Perimeter of a square is the sum of all four equal sides (4 × side length).

Isolate the variable by adding/subtracting first, then dividing/multiplying.

To find a percentage of a number, multiply the number by the percentage (in decimal form).

A prime number has exactly two distinct factors: 1 and itself.

The sum of interior angles in a triangle is always 180°.