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This Addition With Regrouping drill has 40 problems for Grade 2. Bakers theme. Answer key included.
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Max must regroup flour sacks to save the bakery's midnight bread delivery before the timer runs out!
Standard: CCSS.MATH.2.NBT.B.5
Addition with regrouping is a crucial bridge in your second grader's math journey because it moves them from simple, single-digit facts into two-digit thinking. At ages 7-8, children's brains are ready to understand that ten ones can become one ten—a concept that unlocks almost all future math success. When students master regrouping, they build mental flexibility and place-value understanding that prevents confusion later with subtraction, multiplication, and even decimals. This skill appears constantly in real life: a baker combining 15 cookies from one batch with 18 from another, a parent counting 27 crayons plus 16 more, or organizing toys into groups. Students who can regroup confidently develop stronger number sense and confidence with larger numbers, setting them up for third-grade success when multi-digit computation becomes standard.
The most common error is forgetting to regroup or 'carrying' the ten after adding the ones column—students will write 27 + 15 = 312 instead of 42 because they add 7+5 to get 12, then add 2+1 to get 3, and simply concatenate the numbers. Another frequent mistake is regrouping correctly but then forgetting to add the carried ten to the tens column, resulting in an answer that's ten too small. Watch for students who line up numbers incorrectly on the left instead of aligning by place value, which makes regrouping impossible. You'll spot these errors quickly if you ask, 'Show me your tens and ones'—students who can't point to where the regrouped ten went haven't truly grasped the concept.
Create a simple regrouping game at home using coins: give your child a pile of pennies and dimes, then ask them to show you 27 + 16 by first laying out 27 pennies, then 16 more, then trading ten pennies for one dime together. Physically exchanging the pennies makes the 'why' of regrouping visible and memorable. Do this 2-3 times a week with different numbers—your child will start to predict when a trade is coming before they even count, which is true understanding.