Max Rescues Coral Reef Creatures: Addition Regrouping

About this Grade 2 Addition With Regrouping Drill

Addition with regrouping is a critical bridge in your child's math journey. At age 7-8, students are moving beyond single-digit facts into two-digit problems, which requires understanding place value deeply. When your child adds 27 + 15 and realizes they need to regroup 12 ones into 1 ten and 2 ones, they're building the foundation for all future multiplication, division, and multi-digit computation. This skill also strengthens their ability to think flexibly about numbers—recognizing that 10 ones equals 1 ten is a conceptual leap that supports problem-solving across subjects. Even a marine biologist tracking ocean creatures would need this skill to quickly calculate totals from their research! Mastering regrouping now means your child will feel confident and capable with larger numbers in third grade and beyond.

What your student will practice

• Identify when regrouping is needed by recognizing sums of 10 or more in the ones place
• Correctly regroup 10 ones as 1 ten and write it above the tens column
• Add two two-digit numbers with regrouping and verify the final answer
• Apply regrouping reasoning to real-world quantities and word problems

Common mistakes to watch for

The most common error is forgetting to add the regrouped ten to the tens column. For example, a child correctly adds 8 + 7 = 15 in the ones place and writes down 5, but then forgets to carry the 1 and only adds 2 + 3 = 5 in the tens place, getting 55 instead of 35. Another frequent mistake is writing the regrouped 1 in the wrong spot or not writing it at all. Watch for answers that are exactly 10 too small—this almost always signals a missed regrouping. You can spot this by asking your child to explain their steps aloud as they work.