Introduce and reinforce the necessary skills for maths success with the self-checking Hot Dots® system.   Children select an answer against the multiple choice questions with the Talking Pen The pen shows a green or red light for immediate feedback Pens can also be set to an audio setting or to fun sound effects - or both for extra reinforcement Includes three books and one Talking Hot Dots Pen Books are perfect for independent learning reinforcement The three books promote the following maths subjects; Addition (facts 0-10) Subtraction (facts 0-10 and some for 11-15) Telling Time (on the hour, half-hour, quarter-hour and 5-minute increments) Each book includes 64 activities on 32 double-sided pages Books are spiral-bound to make learning easy Books measure 20cm W x 13cm H