There is plenty of number fun to be had with Gantsta Granny’s Mental Maths Games from The World of David Walliams! Designed specifically to aid children in Key Stage 1 and 2 to learn though play, players have to add, subtract and multiply to try and achieve the highest possible scores. This fun, educational box of mental maths games, featuring the iconic Gangsta Granny illustrations by Tony Ross, is the perfect way to make maths fun and encourage children to improve their nummerical skills.Grangsta Granny Mental Maths Games is part of the The World of David Walliams educational games collection, inspired by Britain’s number 1 author! Suitable for age 5 years and over.