Max Conquers the Pizza Palace: Multiples of Ten!

About this Grade 2 Adding Multiples Of 10 Drill

Adding multiples of 10 is a cornerstone skill that bridges single-digit addition and place value understanding. At ages 7-8, students are developing number sense and beginning to see patterns in how our number system works. When children master adding multiples of 10—like 20 + 30 or 50 + 40—they're really learning that 2 tens plus 3 tens equals 5 tens, which deepens their grasp of place value. This skill makes mental math faster and builds confidence for two-digit addition they'll encounter soon. It also helps students recognize that adding 10 repeatedly is the same as skip-counting, connecting different mathematical ideas. By practicing these patterns now, students develop flexible thinking about numbers rather than relying only on counting on their fingers.

What your student will practice

• Add two multiples of 10 up to 100 with accuracy
• Recognize and apply the pattern that 2 tens plus 3 tens equals 5 tens
• Use place value understanding to explain why 20 + 30 equals 50
• Build mental math speed with multiples of 10

Common mistakes to watch for

Many second graders focus on the ones place and ignore the tens, writing answers like 50 + 30 = 80 as "5 + 3 = 8" without recognizing it's actually 5 tens plus 3 tens. Others may count by ones all the way through instead of skip-counting by tens, which is slow and error-prone. Watch for students who write 20 + 30 = 500 because they're not keeping track of place value properly. You can spot these errors by asking the child to explain their thinking: "Show me with your tens blocks" or "Count up by tens with me" to reveal whether they understand the tens or are just guessing.