Click the link, select your level, select 'subtraction' and select time between questions, good luck!
Calculate the perimeter of composite rectilinear shapes. Add all the sides together to find the perimeter (remember you only need to add the outside so if shapes are joined together you don't need to include the inside line!).
Choose your level (*Easier, ** Medium, *** More Challenging) or can you complete all levels?
Click the link above, select your options and have a go!
Read Chapter 2-A Beginner's Guide to Coarse Fishing and complete questions 17-26.