This multi-touch edition has full HD / Retina display resolution and is curriculum-based and teacher-approved. Inside you’ll find over 100 pages of math activities and fun. Built-in breaks, brain teasers, and challenge questions are included as well. It’s all designed to make math practice easy and fun. Whether your child is starting to learn addition or is working to increase existing addition skills, this book will build on that foundation while making learning an adventure. Use this book to help your child learn essential math facts. The book focuses on subtraction facts for subtracting the numbers 4 to 6 from whole numbers up to 12, and also helps your child develop an understanding of many other related concepts. Combine with Critter Subtraction Essentials Levels 1 and 3 to cover all the math facts for subtracting the numbers 0 through 12 from whole numbers up to 12.