Students commonly discover the need to regroup numbers as they add multi-digit numbers. They divide each ten into 10 ones, each hundred into 10 tens, and so on. Use add 6-digit and 4-digit numbers with regrouping worksheet to give your students 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.