Add two 6-digit numbers without regrouping worksheet is a great way to help learners become fluent with the concept of addition. It is important for students to understand the basic relationship among digits in the numbers they are adding. When students add multi-digit numbers, they add digits at the same places to get the sum. Add two 6-digit numbers without regrouping worksheet provides plenty of practice with this concept. 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.