Max Rescues Snowbound Penguins: Addition Sprint

About this Grade 2 Adding Multiples Of 10 Drill

Adding multiples of 10 is a cornerstone skill that helps second graders build number sense and mental math fluency. When children master 30 + 20 or 50 + 40, they're learning to recognize patterns in our base-10 number system—a foundation that makes all future multi-digit addition much easier. At seven and eight years old, students are developmentally ready to see that adding tens works the same way as adding ones: 3 tens plus 2 tens equals 5 tens. This skill bridges concrete counting strategies and abstract reasoning, helping students move away from counting on their fingers toward efficient, confident computation. Real-world scenarios—like combining groups of dimes, adding prices on a snow day's wish list, or calculating scores in games—make this abstract thinking feel tangible and relevant.

What your student will practice

• Add two multiples of 10 within 100 using place value understanding
• Recognize that 30 + 20 is the same as 3 tens + 2 tens
• Apply adding multiples of 10 to solve one-step word problems
• Explain addition of multiples of 10 using tens language or models

Common mistakes to watch for

Many second graders add the digits but forget the zero, answering 3 + 2 = 5 instead of 30 + 20 = 50. Others mentally add correctly but write the answer as 5 instead of 50, showing they computed the tens but lost track of place value in their written response. Watch for students who still count by ones (1, 2, 3... up to 30, then continuing to 50) rather than counting by tens. If you see these patterns, review with concrete base-10 blocks or bundles of ten objects to anchor the concept.