Max Rescues Dragon Eggs: Collect Tens Quest!

About this Grade 2 Adding Multiples Of 10 Drill

Adding multiples of 10 is a cornerstone skill that helps second graders see patterns in our number system and build mental math fluency. When children understand that 20 + 30 is just 2 tens plus 3 tens, they're developing number sense that makes larger addition problems feel manageable. This skill directly supports their ability to solve word problems, make change, and estimate costs at stores—skills they'll use every single day. By mastering multiples of 10, students also prepare themselves for two-digit addition without regrouping, a critical stepping stone in Grade 2 and beyond. Seven and eight-year-olds are developmentally ready to see these patterns because they've internalized what 10 means. Practice with multiples of 10 builds confidence and shows students that math follows logical, predictable rules.

What your student will practice

• Recognize and add two-digit multiples of 10 (10, 20, 30, etc.) fluently
• Understand that adding multiples of 10 means adding tens and ignoring zeros
• Apply addition of multiples of 10 to solve word problems involving real scenarios
• Build automaticity with sums within 100 using only multiples of 10

Common mistakes to watch for

The most common error second graders make is adding the zeros as if they were individual ones, treating 20 + 30 as 2 + 3 + 0 + 0 = 5 instead of 50. You'll also see students write the answer without any tens place value understanding—for example, writing '5' instead of '50.' Another frequent mistake is students who can do 2 + 3 = 5 but then freeze when those same numbers have zeros attached. Watch for hesitation or finger-counting on every problem; this signals the student hasn't yet internalized the pattern that 20 + 30 will always equal 50.