Extra Practice is essential for mastering mathematical skills. The adage "Practice makes perfect" holds true, especially in the realm of arithmetic. Once students have a solid grasp of two-digit addition without the need for regrouping, they are ready to tackle the more complex scenarios where numbers require carrying over. This advanced practice not only reinforces their foundational understanding but also prepares them for the intricacies of higher-level math. It's through these progressive exercises that students can refine their calculation techniques and enhance their problem-solving abilities.