colour by simplifying surds with extension

As the title suggests, this is a colouring sheet for practising simplifying surds into the form arootb. It covers single surds and multiplying two surds together. I first created this sheet when I was looking for something fun and different for my more able students, only to find that there was very little for them. Unlike other maths colouring sheets, each sheet only requires three different colours and therefore requires fewer teacher supplies. My students have loved seeing their work displayed on my wall. Two solutions do not fit the pattern and students are encouraged to find their own questions that will fit the pattern allowing for stretch and challenge. The solution is the pattern displayed. The white spaces are where the solution does not fit the pattern.
All feedback gratefully accepted.