Prove algebraically that the recurring decimal 0.2˙1˙k˙0.\dot{2}\dot{1}\dot{k}0.2˙1˙k˙, where k k\,k is an integer from 0 to 9, can be written as 210+k999\displaystyle \frac{210+k}{999}999210+k
203 exam-style questions on Eduqas GCSE Maths Recurring Decimals to Fractions. Each one has a worked solution and a mark scheme showing where the marks go.