Sherlock Bones and Dr Catson are entangled in an arithmetic adventure. They must follow a teasing trail of addition- and subtraction-themed puzzles. Its up to the reader to solve each sum, all in the hope of foiling Professor Morirattys evil plan. This charming activity book is a fill-in book allowing children to test their numeracy skills. Ideal for children aged 7 , this fun-filled addition and subtraction-themed maths puzzle book allows children to test their numeracy skills.

Sherlock Bones and Dr Catson are entangled in an arithmetic adventure. They must follow a teasing trail of addition- and subtraction-themed puzzles. Its up to the reader to solve each sum, all in the hope of foiling Professor Morirattys evil plan. This charming activity book is a fill-in book allowing children to test their numeracy skills. Ideal for children aged 7 , this fun-filled addition and subtraction-themed maths puzzle book allows children to test their numeracy skills.