This two-book set with included Hot Dots® pen provides children with 100 lessons on a variety of math skills appropriate for each grade, from place value and math facts to telling time and identifying money values. Plus, each set includes 15 challenge activities that prepare children for skills at the next grade level.Details:9.2" x 8.5" x 2" box sizeIncludes 100 lessons and 15 challenge activitiesRequires 2 AAA batteries (sold separately)For ages 7 and upContents:2 books (50 pages each)Hot Dots pen