LeapFrog Numbers Dry Erase Activity Book for Grades K-1 with Washable Dry Erase Marker (19451) Provides multiple activities to reinforce early educational objectives Workbook content helps your child practice addition, subtraction, tracing and writing numbers Dry erase, spiral-bound format is durable and encourages repeated practice - includes 1 washable dry erase marker Offers a fun learning experience for both parent and child For ages 5 and up