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 5-digit and 4-digit numbers without regrouping worksheet provides plenty of practice with this concept. In each problem, the numbers are laid out in the vertical format. In this format, pair of digits in each successive place are tackled one by one. This helps students follow a structured approach.