Prove algebraically that the sum of any three consecutive integers is always a multiple of 3.
Practise Edexcel GCSE Maths Proof with exam-style questions for Foundation and Higher tier. 56 questions, matched to the Edexcel GCSE Maths (1MA1) 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.