maths revision

IGCSE and GCSE exams are upon us – time to let loose write outs for the most recent papers to help with final revision and checking.  Are these getting harder or am I getting thicker? Files chucked in my exam bucket at http://jped.co.uk/ExamBucket/exambucket.php

Difference of two squares, staple diet for GCSE maths students, is first proposition in Carr’s book of magic and has ancient geometric roots in Euclid Book II.