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This Addition With Regrouping drill has 40 problems for Grade 2. Pilots theme. Answer key included.
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Max's airplane fuel gauge shows 27 + 15 gallons needed—he must calculate fast to rescue stranded pilots!
Standard: CCSS.MATH.2.NBT.B.5
Preview
Page 1 — Drill
Page 2 — Answer Key
What's Included
About this Grade 2 Addition With Regrouping Drill
Addition with regrouping is a major milestone in second grade because it moves students beyond single-digit facts into real two-digit thinking. When children learn to regroup (or "carry"), they're developing number sense and understanding how place value actually works—tens and ones aren't just labels, they're tools for solving problems. This skill opens the door to multi-digit addition and builds confidence for third grade math. At ages 7-8, students' brains are ready to hold multiple steps in their heads, making this the perfect time to introduce regrouping. Mastering addition with regrouping helps children see that math is a logical system with consistent rules, not a collection of random facts to memorize. You'll notice this skill showing up everywhere: calculating allowance, figuring out how many snacks to bring to a class party, or even how many flight hours a pilot needs to log to reach their goal.
What your student will practice
- Add two-digit numbers using regrouping when ones column totals 10 or more
- Identify when a sum in the ones place requires regrouping to the tens place
- Write regrouped numbers correctly, showing tens and ones in proper columns
- Solve word problems involving addition with regrouping
Common mistakes to watch for
The most common error is students forgetting to add the regrouped ten to the tens column. You'll see answers like 27 + 15 = 312 because they added 7 + 5 = 12, wrote down the 2, but then forgot to add that extra 1 ten to 2 + 1. Another frequent mistake is writing the regrouped number in the wrong spot or losing track of what they regrouped. If a student's answers jump between being correct and wildly off (like 45 + 18 = 53, then 36 + 27 = 513), they're likely regrouping inconsistently or not checking their work.
Ask your child to help you figure out supplies for a small project—say you're buying 17 toy cars and want to add 15 more to make a collection. Have them solve it on paper using the column method, then count out actual objects (blocks, buttons, coins) to verify their answer. This concrete-to-abstract connection helps them see regrouping isn't just a rule, it's a real strategy that gets the right answer every time when they follow the steps carefully.