Max Rescues the Birthday Cake: Addition Regrouping Race!

About this Grade 2 Addition With Regrouping Drill

Addition with regrouping is a critical stepping stone in your second grader's math journey because it builds the foundation for all multi-digit computation they'll encounter in upper grades. At ages 7-8, children's brains are developing the ability to hold multiple steps in mind simultaneously—a skill that regrouping demands. When your child adds 27 + 15, they must recognize that 7 + 5 equals 12, understand that 12 ones becomes 1 ten and 2 ones, and then add the tens column. This process strengthens number sense and shows students that numbers can be broken apart and recombined in different ways. Beyond math class, regrouping teaches flexible thinking: the same skill helps children solve problems creatively and adapt strategies when one approach doesn't work. Mastering this concept now prevents gaps in multiplication, division, and even word problem solving later on.

What your student will practice

• Add two-digit numbers by regrouping ones into tens
• Identify when regrouping is necessary in addition problems
• Write sums correctly after carrying to the tens place
• Apply regrouping strategies to solve real-world addition scenarios

Common mistakes to watch for

The most common error is forgetting to add the regrouped ten to the tens column—students correctly combine 8 + 7 = 15 but then write down only the 5 and forget the carried 1. Another frequent mistake is writing both digits of a two-digit sum in the ones place instead of regrouping (28 + 14 becomes 312 instead of 42). You'll spot these errors by checking whether the tens column addition includes the carried 1, and by noticing if sums in the ones place exceed 9 without being regrouped. Ask your child to explain their work aloud; they often catch their own mistakes when verbalizing each step.