I am teaching introductory Algebra to a low ability Year 7 class. We are just doing the basic four operations (adding, subtracting, multiplying and dividing). We've expanded brackets and covered basic substitution. I am finding they keep confusing their rules eg. a + a + a = a^3 and a x a x a = 3a^3. They are committing a variety of big errors. Does anyone have any suggestions for building up their skills. I have used some matching card activities, many interactive whiteboard activities, worksheets, summary cards to consolidate their understanding but I'm having limited success. I appreciate any ideas that enables these students to have fun and learn.