Max Rescues the Rainbow Unicorns: Addition Quest

About this Grade 2 Addition With Regrouping Drill

Addition with regrouping is a critical bridge skill that moves second graders beyond simple, single-digit facts into the real math they'll encounter every day. When your child counts coins from their piggy bank, splits a snack with a friend, or helps you track items at the grocery store, they're often working with numbers that require regrouping—like combining 17 and 15. This skill strengthens their number sense and teaches them that 10 ones can become 1 ten, a foundational concept for all multi-digit math. At ages 7 and 8, children's brains are ready to hold multiple steps in working memory, making this the perfect time to develop automaticity with regrouping. Mastering this now builds confidence and prevents gaps that trip up students in third grade and beyond.

What your student will practice

• Add two-digit numbers that require carrying to the tens place
• Recognize when the ones column sum equals 10 or more
• Regroup 10 ones as 1 ten correctly and consistently
• Solve 8–12 addition-with-regrouping problems with 80% accuracy

Common mistakes to watch for

The most common error is forgetting to carry the ten after adding the ones column—a student might add 7 + 8 in the ones place, get 15, write down 5, but then forget to add 1 to the tens. Another frequent mistake is carrying the 1 but then adding it to the wrong place or adding it twice. You'll spot these errors by looking at the tens column; if a student wrote a small 1 above the tens place but didn't include it in their final answer, or if their tens digit is too large, regrouping confusion is likely the culprit. Asking your child to "show me where the 1 ten came from" often reveals whether they understand the concept or just memorized a procedure.