Max Conquers the Basketball Court: Addition Championship!

About this Grade 2 Addition With Regrouping Drill

Addition with regrouping is a critical bridge skill that moves second graders from counting-based math to genuine number sense. When students add two-digit numbers like 24 + 18, they discover that 4 + 8 makes 12—too large for the ones place—and must "regroup" that 10 into the tens column. This process builds mental flexibility and prepares them for multi-digit addition, subtraction, and eventually multiplication. At 7 and 8 years old, children's brains are developing the abstract thinking needed to see numbers as groups of tens and ones rather than just individual items. Mastering regrouping now prevents frustration later and gives students confidence that they can solve problems through logical steps, not just memorization. These skills directly transfer to real-world situations like combining money, tracking scores in sports, or solving word problems about everyday objects.

What your student will practice

• Add two-digit numbers using regrouping when ones sum to 10 or more
• Identify when to regroup and rename 10 ones as 1 ten
• Record regrouping accurately using the standard algorithm notation
• Solve addition problems with regrouping in vertical form with speed and accuracy

Common mistakes to watch for

The most common error is students forgetting to add the regrouped ten to the tens column after combining the ones. For example, with 27 + 15, they correctly add 7 + 5 = 12, write down the 2, but then add only 2 + 1 = 3 in the tens place instead of 3 + 1 = 4. Another frequent mistake is writing 12 directly in the ones place without recognizing it needs to be split into tens and ones. You'll spot these errors when the final answer is consistently 10 too small, or when the ones digit is written correctly but two digits appear in one column.