The Easy 4 worksheet, Regrouping Review, helps second graders notice when carrying matters. Part A asks them to sort six addition expressions like 54+23, 37+46, and 76+18 into No Regrouping and Needs Regrouping groups. Part B has five fill-in-the-blank addition problems, including 26 + 47 and a missing-addend puzzle 67 + ___ = 91. Part C finishes with four true-or-false statements such as 43 + 38 = 81 and 92 - 57 = 45 to catch common mistakes. Students sharpen their place-value thinking and gain a steady, confident way to add and subtract two-digit numbers.