Perimeter and area for KS3
Area and perimeter of a square
This CIMT interactive resource provides students with immediate feedback on their work.
Area and perimeter of a rectangle
This CIMT interactive resource provides students with immediate feedback on their work.
CIMT area and perimeter workbook
These CIMT books provide lots and lots of practice on basic skills to do with area and perimeter.
Area of irregular shapes on a grid
If you have access to the 10 ticks worksheets at your school there are brilliant worksheets on estimating the area of irregular shapes in Level 4 Pack 8 pages 19 and 20. I actually used those ones rather than this one when I did the activity with my class.