Max Rescues Paper Cranes: Subtraction with Borrowing

About this Grade 2 Subtraction With Borrowing Drill

Subtraction-with-borrowing (also called regrouping) is a turning point in your child's math journey. At age 7-8, students move beyond simple subtraction facts to tackle two-digit problems like 32 - 15, where they can't subtract the ones place directly. This skill builds number sense and shows children that numbers are flexible—a ten can become ten ones when needed. Mastering regrouping now strengthens their ability to handle larger numbers in third grade and beyond. It also develops logical thinking: they learn to break problems into manageable steps rather than guessing. When children understand they can "borrow" from the tens place, they gain confidence tackling problems that once seemed impossible. This foundation matters because regrouping appears in multiplication, division, and even real-world money problems throughout elementary school.

What your student will practice

• Regroup tens as ones to subtract in the ones place
• Identify when borrowing is necessary in a subtraction problem
• Solve two-digit subtraction problems with regrouping accurately
• Explain their borrowing strategy using tens and ones language

Common mistakes to watch for

The most common error is children forgetting to reduce the tens digit after borrowing. For example, in 32 - 15, they borrow from the 3 to make the ones place work, but then still subtract using 3 tens instead of 2 tens. You'll see answers like 27 instead of 17. Another frequent mistake is borrowing when it's not needed—a child might regroup for 34 - 12 even though 4 - 2 works fine. Watch for these patterns: crossed-out numbers that don't match the new values, or answers that are too large. If the answer seems off by 10, borrowing was likely forgotten or done incorrectly.