Life of Fred
Life of Fred Elementary Series for an introduction to Mathematics. 10 books in total.
Life of Fred Elementary Series - a bridge between the Elementary series and the Junior Maths
Life of Fred - Junior Maths aimed at students aged 12 and under.
Life of Fred - Senior Maths aimed at children aged 12 - 17
Life of Fred - Advanced Maths is aimed at young people aged 17 and over and is roughly equivalent to "A" Level and higher college mathematics.