Make r r\,r the subject of the formula 1s=1r+1t\displaystyle \frac{1}{s} = \frac{1}{r} + \frac{1}{t}s1=r1+t1
Practise AQA GCSE Maths Rearranging Harder Formulae with exam-style questions for Foundation and Higher tier. 52 questions, matched to the AQA GCSE Maths (8300) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.