Humble Math - Double Digit Addition & Subtraction : 100 Days of Practice Problems: Grades 1-3, Word Problems, Reproducible Math Drills [Spiral-Bound]

100 days of reproducible addition and subtraction practice problems (with answer key). Double digits, triple digits, and more. Designed to make daily study routines simple and effective. Word problems are included with each day to promote higher level thinking and answers are listed in the back of the book.