Give your little one the opportunity to dive deeper into addition and subtraction with this add and subtract tenths and hundredths less than 1 without regrouping worksheet. Students find the missing number while adding and subtracting decimals by using the relationship between addition and subtraction. Add and subtract tenths and hundredths less than 1 without regrouping worksheet does not require them to regroup numbers. 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.