Give your little one some practice building addition and subtraction skills with this add and subtract tenths less than 100 with regrouping worksheet. 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, 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.