Write 720 7\sqrt{20}\,720 in the form k5k\sqrt{5}k5, where k k\,k is an integer.
Practise Oxford AQA IGCSE Maths Surds with exam-style questions for Core and Extended tier. 20 questions, matched to the Oxford AQA IGCSE Maths (9260) specification and written in Paper 1 and Paper 2 (Core: 1C and 2C; Extension: 1E and 2E) 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.