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This step-by-step workbook will help your child learn to subtract from numbers up to 20. Your child will first practice counting backward and writing the numbers in reverse sequence. Next, he or she will begin learning to subtract numbers 1 through 9, and then work up to subtracting numbers up to 20. Like all our Grow to Know Workbooks, the smaller format of this book is perfect for little hands and on-the-go learning.