Max Rescues Balloons: Subtract by Tens!

About this Grade 1 Subtracting Multiples Of 10 Drill

Subtracting multiples of 10 is a foundational skill that helps first graders recognize patterns in our number system and build confidence with mental math. When children master removing tens—like going from 45 to 35—they're developing number sense and understanding place value in a concrete way. This skill directly supports their ability to tackle two-digit subtraction problems later and makes everyday math feel less intimidating. At ages 6 and 7, students' brains are developing the capacity to hold and manipulate groups of numbers, and multiples of 10 are the easiest groups to work with because they follow a simple, predictable pattern. By practicing these problems now, your child is building the mental flexibility needed for more complex arithmetic. Most importantly, they're learning that math follows rules and that they can figure things out—a mindset that carries them through school and life.

What your student will practice

• Subtract any multiple of 10 from two-digit numbers fluently
• Identify and apply the place-value pattern when removing tens
• Solve one-step word problems involving subtraction of multiples of 10
• Explain their subtraction thinking using tens language

Common mistakes to watch for

The most common error is that students subtract the digits without considering place value—for example, answering 34 − 20 = 24 by subtracting the 2 from the 3 and keeping the 4, rather than removing 20 from the whole number. Another frequent mistake is reversing digits after subtraction, writing 23 instead of 32 when solving 52 − 20. Watch for hesitation when the ones digit is 0 (like 50 − 20); many first graders second-guess themselves even though these are easier. If your child is counting on fingers for every problem or cannot explain "I took away two tens," they need more concrete practice with base-ten blocks or bundled straws before moving forward.