There are 31 marbles in a jar.
13 of the marbles are blue. The rest of the marbles are green.
What fraction of the marbles are blue?
Practise OCR GCSE Maths Writing, Simplifying and Ordering Fractions with exam-style questions for Foundation and Higher tier. 76 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers 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.