Max Rescues the Wild West Cattle: Subtraction Showdown!

About this Grade 1 Subtracting Multiples Of 10 Drill

Subtracting multiples of 10 is a cornerstone skill that helps first graders recognize patterns in our number system and build mental math flexibility. When children can quickly subtract 10, 20, or 30 from a number, they're developing number sense—understanding that 45 − 10 = 35 without counting on their fingers. This skill directly supports their ability to solve larger addition and subtraction problems later, and it makes everyday tasks like counting money or measuring easier to understand. At ages 6–7, students' brains are wired to spot patterns, and multiples of 10 are the most obvious pattern in our base-10 system. Mastering this concept builds confidence and sets the foundation for second-grade computation. By practicing these problems, your child learns that subtracting 10 only changes the tens place, not the ones—a crucial insight that makes math feel logical rather than random.

What your student will practice

• Quickly subtract multiples of 10 from two-digit numbers with automaticity
• Recognize that the ones digit stays the same when subtracting multiples of 10
• Solve word problems involving subtraction of multiples of 10
• Apply tens-and-ones place value understanding to subtraction

Common mistakes to watch for

The most common error is that students subtract from the ones place instead of the tens place, turning 34 − 10 into 24 instead of 24. They may also recount all the way down instead of recognizing the pattern, slowing their processing. Watch for students who write answers like 25 when solving 35 − 10—they've confused which digit changes. You can spot this by asking, 'Show me with your tens and ones blocks' or 'Does the 5 stay the same?'—students who answer 'no' need more concrete practice.