Carol Vorderman 
Her a Hwyl Datrys Problemau Mathemateg, Oed 7-9 (Problem Solving Made Easy, Ages 7-9) 

Help your child to be the top of the class with the best-selling home-study series from Carol Vorderman. Carol Vorderman can help your child succeed in maths with this homeschool learning resource for 7-9 year olds.
Problem Solving Made Easy is one of Carol Vorderman»s series of DK workbooks packed with notes and tips to make home learning about maths easy and fun!