This workbook has 100 days of reproducible addition and subtraction practice problems for digits 0-20. Use these pages as timed tests to improve fluidity or let students complete them at their leisure. Answer key is located at the back of the book. Workbook Contents: Adding Digits 0-5 ........................ pages 1-8 Adding Digits 0-7 ....................... pages 9-16 Adding Digits 0-10 ...................... pages 17-40 Subtracting Digits 0-10 ............... pages 41-48 Subtracting Digits 10-20 ............ pages 49-60 Subtracting Digits 0-20 .............. pages 61-80 Adding and Subtracting ............... pages 81-100 (Answer Key in Back)