172 pages. Discover the Math & Reading Flashcard Series. Flash cards with attitude and critters. Use this book to help your child learn numbers. This book focuses on numbers 1 to 20 represented as both numerals and words. Complete with 5 different flash card sets that help children learn not only to recognize numerals, but also number order, related representations of numbers, and more. Links for easy navigation and number games are included as well. In full color on color devices.