Max Rescues the Sandwich Shop: Subtraction Sprint!

About this Grade 2 Subtraction With Borrowing Drill

Subtraction-with-borrowing (also called regrouping) is a crucial milestone in Grade 2 because it moves students beyond simple subtraction facts into multi-digit problem-solving. At ages 7–8, children are developing the abstract thinking needed to understand that 10 ones can become 1 ten, and vice versa—a concept that feels almost magical at first but becomes essential for all future math. When a student encounters a problem like 32 − 15, they need to "borrow" from the tens place to subtract ones, mirroring how we might trade a ten-dollar bill for ten single dollars in real life. Mastering this skill builds confidence and mental flexibility, helping students see numbers as flexible groups rather than fixed sequences. It also prevents frustration when they reach third grade and encounter larger numbers. Students who practice borrowing now develop a strong number sense that makes multiplication, division, and even simple money transactions (like figuring out change when buying sandwiches at lunch) feel manageable rather than overwhelming.

What your student will practice

• Understand when borrowing is needed in subtraction problems
• Regroup tens into ones to complete subtraction accurately
• Apply borrowing across multiple two-digit subtraction problems
• Check subtraction work using addition to verify answers

Common mistakes to watch for

The most common error is that students forget to reduce the tens digit after borrowing from it. For example, in 32 − 15, they borrow 1 ten to make the ones work, but then still use 3 in the tens place instead of 2. Another frequent mistake is borrowing even when it's not necessary—a student might try to borrow in 34 − 12 because they've memorized the procedure without understanding when it applies. You'll spot these errors when the answer is off by exactly 10 or when borrowing appears in every problem regardless of whether the top ones digit is larger than the bottom one.