◆Improve your child's success in class with lots of addition and subtraction practice - Solutions Included. The answer key is included in the back of this book, so students can check their answers easily. • A few minutes of math a day can help students tremendously. • Use these pages as timed tests to improve fluidity or let students complete them at their leisure. • This book contains lots of math worksheets with over 4000 problems - Comfortable spacing in numbers for calculating where needed. • The problems include addition facts, subtraction facts, double-digit addition and subtraction with and without regrouping, adding 3 double-digit numbers in stacks as well as fill in the blank problems to find missing addends and subtrahends.