This book contains 41 worksheets with appoximately 50 problems on each sheet for drill. The drills in this book are for numbers 0 to 20 and only addition and subtraction are included. Some problems appear more than once, but that is the purpose of the book. Drill!A child is supposed to work the problems out in his or her own head. The problems should not be worked out on paper, nor should a calculator be used. If you want to sharpen your math skills or if you want your children to be a quick and accurate number expert, this book is for you. Examples from the book: 8+7=?9+2-7=?5+___? ___=8
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