Max Discovers Lost Cities: Addition Regrouping Quest

About this Grade 2 Addition With Regrouping Drill

Addition with regrouping is a crucial bridge between simple addition facts and the multi-digit math your child will encounter throughout elementary school. At ages 7-8, students' brains are developing the ability to hold multiple steps in mind simultaneously—exactly what regrouping requires. When your child adds 24 + 18, they're not just combining numbers; they're learning to recognize when a group of ten forms, rename it, and use that insight to find the correct sum. This skill builds number sense and prepares them for subtraction with regrouping, multiplication, and eventually division. Beyond math class, regrouping mirrors real-world thinking: when you're counting coins or organizing objects into groups, you're naturally regrouping. Mastering this concept now creates confidence and reduces math anxiety later.

What your student will practice

• Identify when the ones place sum is ten or greater
• Regroup ten ones into one group of ten
• Add two-digit numbers using regrouping strategy
• Explain and write regrouping using words and numbers

Common mistakes to watch for

The most common error is forgetting to add the regrouped ten to the tens column. A student might correctly add 7 + 5 = 12 in the ones place, write down the 2, but then forget that the 1 (representing ten) needs to be added with the other tens. Watch for answers like 35 when solving 27 + 18 (the correct answer is 45). Another frequent mistake is reversing the process—writing 12 in the ones place instead of writing 2 and carrying 1. You'll spot this immediately because the answer will be too large or the work looks messy.