Max Rescues Aliens: Space Station Subtraction Blast

About this Grade 1 Subtracting Multiples Of 10 Drill

Subtracting multiples of 10 is a foundational skill that helps first graders see patterns in numbers and builds confidence with larger quantities. When children master 35 - 10 or 50 - 20, they're learning that the ones place stays the same while only the tens change—a concept that makes mental math easier and faster. This skill directly supports the place-value understanding that anchors all future addition and subtraction. Beyond the classroom, your child uses this thinking when counting out toys, managing small allowances, or even organizing collections. By practicing these problems now, you're helping your six- or seven-year-old develop the number sense needed for multi-digit math in later grades. It's a small skill with big payoff.

What your student will practice

• Subtract 10, 20, 30 from two-digit numbers mentally
• Recognize that only the tens digit changes when subtracting multiples of 10
• Solve 8-12 subtraction problems accurately in under five minutes
• Apply subtracting multiples of 10 to word problems with concrete contexts

Common mistakes to watch for

Many first graders mistakenly subtract from both the tens and ones places, turning 42 - 10 into 32 instead of 32. Others may confuse the direction and add instead of subtract when they see the minus sign, especially if they're still building automaticity with the symbol itself. Some children also 'count back' inefficiently instead of recognizing the pattern, which slows them down. Watch for kids who pause and recount on their fingers for every problem rather than recognizing that 10 less simply means one fewer group of ten.