Max Rescues Lost Owls: Addition Regrouping Race!

About this Grade 2 Addition With Regrouping Drill

At age 7 and 8, second graders are building the mental math foundation that will support all future arithmetic. Addition-with-regrouping—sometimes called "carrying"—is the bridge between simple single-digit facts and the two-digit numbers children encounter in everyday life: combining allowance amounts, adding pages read, or calculating toy collections. When students master regrouping, they develop number sense and understand that 10 ones can become 1 ten, a concept critical for place value understanding. This skill also strengthens their working memory and logical thinking, as they must hold multiple steps in mind simultaneously. Without fluency in regrouping, students struggle with subtraction, multiplication, and later algebra. These drill exercises build the automaticity and confidence needed so that regrouping becomes second nature rather than something that requires conscious effort.

What your student will practice

• Recognize when a sum in the ones place equals 10 or more
• Regroup 10 ones as 1 ten and write the regrouped number correctly
• Add two-digit numbers with regrouping using accurate place value
• Solve multi-step addition problems with regrouping independently

Common mistakes to watch for

The most common error is forgetting to regroup altogether—a student adds 17 + 15 and writes 212 instead of 32, adding ones and tens in separate columns without carrying. Another frequent mistake is regrouping correctly but then forgetting to add the carried 1 to the tens place, so 19 + 14 becomes 23 instead of 33. You'll spot this by looking for answers that are 10 less than correct, or by noticing the student's ones column is correct but the tens column is missing that extra 1. Some students also regroup when they shouldn't, writing 14 + 12 as 26 instead of 26—they carried a 1 unnecessarily.