Calculating with fractions, converting between forms, percentage change, reverse percentages and compound interest.
Fractions, decimals and percentages are three ways of writing the same thing; fluent conversion between them is essential.
Calculating with fractions
- Add/subtract: use a common denominator.
- Multiply: multiply numerators and denominators, then simplify.
- Divide: multiply by the reciprocal (flip the second fraction).
- Convert mixed numbers to improper fractions first.
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