Can your young mathematician add and subtract tenths and hundredths less than 1 without regrouping? That's exactly what they do here. 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 each problem, the numbers are laid out in the horizontal format. Students should try to use different strategies involving composing and decomposing numbers to solve these problems. This will help them develop flexibility and fluency.