Can your young mathematician add and subtract two 4-digit numbers without regrouping? That's exactly what they do here. Students use the relationship between addition and subtraction to find the missing number in this worksheet. However, they do not need to regroup numbers to get to the answer in add and subtract two 4-digit numbers without regrouping worksheet. 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.