A free original bilingual lesson connecting fractions and decimals as representations of the same number. Learn the role of the whole or unit, equivalent and mixed fractions, comparison and all four fraction operations, then apply decimal place value and exact calculation. Convert terminating and simple recurring decimals, distinguish an exact value from a rounded approximation, and check an answer’s sign and size. Worked examples, an analogy, a quick reference and 12 explained practice questions build on earlier Numbers and Calculation lessons. Percentages and commercial arithmetic are outside this focused PDF; it is not a complete Mathematics course or full CBT simulation.