Max Conquers the Championship: Addition Racing Challenge

About this Grade 2 Addition With Regrouping Drill

Addition with regrouping is a crucial milestone for second graders because it moves them beyond simple single-digit facts into two-digit problem-solving. At ages 7-8, children's brains are developing the ability to hold multiple steps in mind simultaneously—a skill that regrouping demands. When your child adds 27 + 15, they must recognize that 7 + 5 equals 12, understand that 12 ones become 1 ten and 2 ones, and then add the tens column. This process strengthens working memory and logical thinking that extends far beyond math. Mastering regrouping also builds confidence as children tackle real-world situations like counting allowance, combining game scores, or keeping track of race-car collections. Without this skill, students hit a ceiling in third grade when larger numbers and multiplication become central. Your child is literally rewiring how they think about numbers and place value.

What your student will practice

• Add two-digit numbers with regrouping correctly using tens and ones
• Recognize when the ones column sum exceeds nine and regroup
• Write the regrouped ten above the tens column accurately
• Check their work by confirming the final answer makes sense

Common mistakes to watch for

The most common error is students forgetting to regroup the ten entirely—they'll add 27 + 15 and write 312 because they added ones as 12 but never moved that ten to the tens place. You'll also see children add the regrouped ten twice, getting 53 instead of 42. Another frequent mistake is rewriting the ones digit incorrectly; a child might regroup correctly but write down 2 + 1 = 3 instead of keeping just the 2 in the ones place. Watch for hesitation or erasing in the ones column—that's often a sign they sense something is wrong but don't know why.