Max Conquers the World Games Subtraction Challenge

About this Grade 2 Subtraction With Borrowing Drill

Subtraction-with-borrowing is a critical skill that moves second graders from simple subtraction (like 15 − 3) to more complex problems (like 23 − 8) where they need to regroup. At ages 7–8, children are developing their understanding of place value—tens and ones—and borrowing requires them to think flexibly about how numbers can be broken apart and recombined. This skill builds the number sense that underpins all future multi-digit math, from multiplication to division. Beyond the classroom, children use this thinking when managing small amounts of money, figuring out game scores, or solving everyday problems. Mastering borrowing also boosts confidence; students feel capable when they tackle problems that initially seem too hard. The mental strategies they develop here—decomposing numbers, recognizing when they need help from the tens place—form the foundation for algebraic thinking later on.

What your student will practice

• Regroup tens as ones when the ones digit cannot be subtracted
• Identify when borrowing is needed in subtraction problems
• Solve two-digit subtraction problems with regrouping accurately
• Explain the borrowing process using tens and ones language

Common mistakes to watch for

The most common error is forgetting to reduce the tens place after borrowing. For example, when solving 32 − 7, a student may borrow to make the ones place 12, but then subtract from 3 tens instead of 2 tens, arriving at 26 instead of 25. Watch for students who write the borrowed ten but don't cross out the original number in the tens place—this confusion shows they haven't internalized that borrowing moves value, not creates it. Another red flag: students who try to subtract the larger number from the smaller (7 from 2) and get stuck, rather than recognizing the need to borrow first.