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This Addition With Regrouping drill has 40 problems for Grade 2. Doctors theme. Answer key included.
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Max must add up patient medicine doses before the clinic opens in ten minutes or patients won't get better!
Standard: CCSS.MATH.2.NBT.B.5
Addition with regrouping is a critical bridge skill that moves second graders from simple addition into the flexible thinking needed for multi-digit math. At ages 7-8, children are developing the ability to decompose numbers—breaking 10 into smaller parts—which is essential for regrouping when a ones column adds up to 10 or more. This skill directly connects to how kids count money, track game scores, or help a doctor record patient ages and appointment times throughout a week. When students master regrouping now, they build a strong foundation for subtraction with regrouping, multiplication, and even division later. More importantly, regrouping teaches children that numbers are flexible and can be reorganized—a key insight that builds confidence and problem-solving ability far beyond just getting the right answer.
The most common error is forgetting to add the regrouped ten to the tens column—students write the ones correctly but ignore the carried number entirely. You'll spot this when a child solves 24 + 18 and writes 312 instead of 42. Another frequent mistake is regrouping even when it's not needed; some children will regroup 7 + 2 = 9 by writing it as 19. Watch for students who regroup correctly but then forget to cross out or erase the original ones digit, creating confusion about which numbers they've already counted.
Play a simple game at home using two dice and a tens frame drawn on paper. Roll the dice twice, add the numbers, and have your child build the answer with coins or blocks—pennies for ones, dimes for tens. When pennies reach 10, trade them for a dime together and say aloud: 'We made a new ten!' This physical exchange mirrors what happens on paper during regrouping and gives 7-8 year-olds a concrete picture of why the ten moves columns.