Max Conquers the Bowling Alley: Subtraction Showdown

About this Grade 3 Subtraction With Borrowing Drill

Subtraction with borrowing (also called regrouping) is a crucial skill that moves third graders beyond simple facts into multi-digit problem-solving. At ages 8-9, students are developing the abstract thinking needed to understand that ten ones can become one ten—a concept that feels magical but requires hands-on practice to solidify. This skill appears constantly in real life: figuring out change at a store, calculating how many days until a birthday, or tracking scores in games like bowling where you subtract frames from a total. Without mastery of borrowing, students hit a wall with division, fractions, and algebra later on. The cognitive leap here teaches children that numbers are flexible and can be broken apart and recombined—essential number sense that builds confidence and mathematical thinking for years to come.

What your student will practice

• Regroup tens into ones when the ones place requires borrowing
• Subtract two-digit numbers with regrouping from minuend to subtrahend
• Check subtraction answers using addition as inverse operation
• Apply borrowing strategies to real-world subtraction scenarios

Common mistakes to watch for

The most common error is forgetting to reduce the tens place after borrowing. A student borrows one ten (making it 10 ones) but writes the same number in the tens column instead of reducing it by one. For example, in 32 – 15, they might borrow from the 3 to make 12 ones, then subtract 5 to get 7 ones correctly, but still use 3 as the tens digit instead of 2, writing 37 instead of 17. Watch for answers that are exactly 10 more than they should be. Another red flag: students who never borrow at all and try to subtract the larger digit from the smaller one in the ones place, writing nonsensical results like 13 in the ones position.