We did a rich maths task that was pretty interesting and more challenging that we first thought. It's called Four 4s. The aim was to make each number from 0-20 using only four 4s! We used factorial 4 (4!), the square root of 4, 4 to the power of 2, division, multiplication, addition and subtraction. Some numbers were harder to solve than others but we had an fun time doing so.
