Add and subtract hundredths and thousandths less than 10 with regrouping worksheet is a great way to help learners become fluent with the concept of addition and subtraction. When adding or subtracting decimals, students understand the need to align the decimal points and use zeros as stop signs. They must also regroup the numbers to find the answer on this worksheet. In this worksheet, numbers are laid one on top of another (vertical format). This encourages students to use the inherent place value structure to solve the problems.