Add thousandths less than 1 worksheet is a great way to help learners become fluent with the concept of addition. When adding decimals, students line up the decimal points and add extra zeros to the right of the number so that each decimal has the same number of digits. Students then add digits at each place to find the sum. As the worksheet uses a horizontal format, it allows for more creativity when it comes to how the student solves the problem. In contrast, in the vertical format, students usually employ the standard method to solve.