Arithmetic & Fractions

Get a common denominator to add or subtract, multiply straight across, and flip to divide.

The rules

• Add or subtract fractions only after they have the same denominator.
• Multiply numerators and denominators. To divide, multiply by the reciprocal.
• Order of operations: parentheses, exponents, multiplication and division left to right, then addition and subtraction.
• Simplify at the end, and check whether the answer should be a mixed number or a decimal.