Now I Know My 1,2,3's

Each spread of Now I Know My 1,2,3's: Count and Match and Add with Me! by Nora Gaydos, illus. by Martin Lemelman, features one number, from one to 20 (then 50 and 100), and suggestions on the inside back cover explain to adults how to direct budding mathematicians at various levels. For instance, novices can practice writing each number with the dry-erase marker provided, while more accomplished students can use the more than 100 magnetic pieces included plus a foldout magnetic board for additional hands-on activities, such as counting by tens with magnetic red brick bars. Everything gets stored in a handy drawer, the top of which neatly fits over the book's back cover. (innovative KIDS, $16.99 ages 3-6 ISBN 1-58476-068-0; Apr.)