Everyone can knit a square to make a colourful wool blanket to donate to your favourite charity. What size needles will you use? How much wool to knit just one square? How much will you need for all 42 squares? How much time will this take? What’s the fastest time for someone to knit just one square? Do stripes take longer to knit? Why? If wool costs $4.75 per ball, how much will the whole blanket cost? If you knit just 42 squares, how large should each square be in centimetres? Do blankets vary in size or are they all one measurement?