This add decimals less than 1 with regrouping worksheet has a set of problems curated to ensure that your child becomes more proficient in addition. When adding decimals on this worksheet, students align the decimal points and use zero as a placeholder. They must also regroup the numbers to determine the sum. This worksheet is about practicing the column method in which numbers are written one on top of another. In this method, students use their place value understanding to solve the problems.