Learning from home has never been so easy - this fun, educational, maths workbook allows children to test their numeracy skills with guided addition and subtraction puzzles.

Sherlock Bones and Dr Catson are entangled in an arithmetic adventure. They must follow a teasing trail of addition- and subtraction-themed puzzles. It's up to the reader to solve each sum, all in the hope of foiling Professor Moriratty's evil plan.

Ideal for children aged 7 to 11 (KS2), this charming activity book takes kids on an interactive adventure to improve their maths skills.