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This Addition With Regrouping drill has 40 problems for Grade 2. Sky Islands theme. Answer key included.
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Max discovered stranded animals across floating islands—he must solve addition problems to build rescue bridges before sunset!
Standard: CCSS.MATH.2.NBT.B.5
Addition with regrouping (also called carrying or renaming) is a crucial stepping stone in your second grader's math journey. At ages 7–8, students are moving beyond single-digit facts to tackle two-digit problems, which requires understanding place value deeply—how 10 ones become 1 ten. This skill directly supports their ability to handle money, tell time, and solve real-world problems like combining groups of items. When students master regrouping, they're building mental flexibility and the foundation for multiplication, division, and algebra later on. Without this solid understanding now, gaps can widen quickly. The good news: with consistent, short practice and concrete examples (like bundling straws or thinking about sky-islands as clusters of villages), most second graders grasp this concept confidently within weeks.
The most frequent error is forgetting to regroup entirely—a student adds 17 + 15, gets 12 in the ones column, and writes '12' as the answer instead of recognizing they have 1 ten and 2 ones. Another common pattern is regrouping but then forgetting to add the extra ten to the tens column, leaving it out of the final answer. Watch for students who consistently rush past the ones column or who write messy numerals that blur their place value understanding. If you notice errors clustering in the 'writing the regrouped ten' step, that's the specific skill to target in isolation.
Play a real-world addition game at home using two standard dice. Roll both dice, add the numbers together (you'll often get sums needing regrouping between 7–12), and physically show regrouping with objects—pennies, blocks, or even drawing circles and bundling them into groups of 10. Say aloud: 'I have 8 ones and 7 ones. That's 15 ones, which is 1 ten and 5 ones.' This tactile, verbal practice transfers beautifully to pencil-and-paper work and takes just 5 minutes daily.