Max Rescues the Puppet Theater: Adding Multiples Sprint

About this Grade 2 Adding Multiples Of 10 Drill

Adding multiples of 10 is a foundational skill that helps second graders understand our base-10 number system and builds confidence with mental math. When children recognize that 20 + 30 is really "2 tens plus 3 tens equals 5 tens," they're developing number sense that makes larger addition problems feel manageable. This skill directly supports fluency with two-digit addition, which is essential for Grade 2 success. By mastering these patterns, students learn that they don't need to count on their fingers anymore—they can think in groups. This efficiency transfers to real-world situations like combining groups of coins, stacking objects, or figuring out totals during activities like a puppet show where you're counting props in sets of 10. Most importantly, this practice shows young learners that math follows predictable patterns, which boosts their problem-solving confidence at a critical developmental stage.

What your student will practice

• Recognize and fluently add two multiples of 10 within 100
• Apply base-10 thinking to skip-count by tens and add groups
• Explain adding multiples of 10 using place-value language
• Solve word problems requiring addition of multiples of 10

Common mistakes to watch for

The most common error is that students add the tens digits but forget to write the zero at the end—for example, writing 3 when solving 20 + 30 instead of 50. Another frequent mistake is treating the tens place like ones, so they might count on by ones: "20, 21, 22..." instead of "20, 30, 40..." You'll spot this when a child gets 20 + 30 wrong but can correctly add 2 + 3. Some students also struggle when the problem is written horizontally versus vertically, suggesting they haven't internalized the pattern yet. Have them say aloud "___ tens plus ___ tens equals ___ tens" to anchor the concept before checking their written answer.