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This Addition With Regrouping drill has 40 problems for Grade 2. Lemonade theme. Answer key included.
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Max's lemonade stand is flooding! He must solve addition problems fast to save his recipe cards before they get soaked!
Standard: CCSS.MATH.2.NBT.B.5
Addition with regrouping is a pivotal skill that builds directly on single-digit facts your second grader has already mastered. When students add two-digit numbers like 27 + 15, they encounter sums in the ones place that exceed 9—requiring them to "carry" or regroup a ten to the tens column. This bridges the gap between concrete counting and abstract place-value thinking, strengthening their number sense and preparing them for multi-digit multiplication and division later on. At ages 7-8, children's brains are developing the working memory needed to track multiple steps simultaneously, and regrouping exercises that challenge them just enough—like figuring out how many cups of lemonade two batches make when one batch has 18 cups and another has 14—build cognitive flexibility. Mastering this skill now prevents gaps that make third and fourth grade math feel overwhelming.
The most common error is forgetting to add the regrouped ten to the tens column—a student will correctly add 8 + 5 = 13 in the ones place, write down the 3, but then forget the carried 1 and only add the original tens digits. Another frequent mistake is regrouping incorrectly when the ones sum is exactly 10; some children write '10' in the ones place instead of '0' and carrying '1.' You can spot this by checking if their answer makes sense: 28 + 14 should be close to 40, so if they wrote 212, something went wrong. Have them circle where they carried the 1 each time.
Play a simple store game at home using small items (coins, crackers, toys) priced between 10–20 cents or points. Ask your child: 'If this costs 17 cents and that costs 15 cents, how much for both?' Have them physically group items into tens and ones on the table before writing the number sentence, so the regrouping becomes visible and concrete. This real-world context makes the abstract column work make sense, and it takes just 5 minutes while building confidence.