Humble Math - Double Digit Addition & Subtraction: 100 Days of Practice Problems: Ages 6-9, Reproducible Math Drills, Word Problems, KS1, Grades 1-3, - Humble Math

100 days of reproducible addition and subtraction practice problems. Double digits, triple digits, and more. Designed to make daily math 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.