This add and subtract hundredths and thousandths less than 100 with regrouping worksheet consists of tasks to help your young mathematician develop fluency with addition and subtraction. Students understand that when adding or subtracting decimals, it is important to align the decimal points and use zeros as placeholders. In this worksheet, they also need to regroup numbers to get the result. 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.