Add 9 within 20: Horizontal Addition Worksheet
Be on your way to become a mathematician by practicing to add 9 within 20.
This add 9 within 20 worksheet consists of a set of questions on addition, which help students develop fluency. In this worksheet, students practice solving problems written in the horizontal format. How numbers are laid out in a problem affects the method a student employs to solve it. Therefore to develop actual fluency and mastery of multiple strategies, students must practice different formats.
