Max Rescues Surfers: Subtract Multiples of 10

About this Grade 2 Subtracting Multiples Of 10 Drill

Subtracting multiples of 10 is a gateway skill that helps second graders recognize patterns in our number system and builds mental math fluency. When children master removing tens—like going from 45 to 35—they're learning that we can break numbers into groups and work with them more easily. This skill directly supports two-digit subtraction, which is the heart of Grade 2 math standards. At ages 7-8, students are developing number sense and learning that math isn't just memorization—it's about understanding how numbers work. Being able to subtract 10, 20, or 30 quickly gives children confidence when they tackle larger problems. Strong skills here also prepare them for multi-digit subtraction in third grade and help them recognize real-world situations, like when a surfer loses 20 points in a competition scoring.

What your student will practice

• Quickly subtract multiples of 10 from two-digit numbers with automaticity
• Recognize that subtracting 10 changes only the tens place, not the ones
• Apply subtracting-multiples-of-10 to real-world word problems with accuracy
• Explain subtraction thinking using tens and ones language or models

Common mistakes to watch for

The most common error is that students subtract the multiple of 10 incorrectly from the tens place—for example, solving 37 - 20 as 37 - 2 = 35, treating the 20 as just 2. Another frequent mistake is students changing the ones digit when they should leave it alone, writing 35 - 10 = 24 instead of 25. You'll spot these patterns by looking at their answers: if the ones digit shifted unexpectedly or if their tens subtraction looks like they ignored the zero, they're likely confusing place value rather than just miscalculating.