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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Toy Store theme. Answer key included.
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Max's toy-store cart zoomed down the aisle! He must collect scattered toys before customers arrive tomorrow morning!
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a foundational skill that helps second graders develop number sense and mental math flexibility. When children master 23 + 10 or 45 + 20, they're learning to recognize that tens are interchangeable units—a concept that makes larger addition problems, multi-digit arithmetic, and even money calculations feel manageable. At seven and eight years old, students are transitioning from counting-all strategies to more efficient thinking patterns. This skill builds confidence because students can often solve these problems mentally without finger counting or manipulatives. Practicing adding multiples of 10 strengthens place value understanding—the idea that a number like 34 is really 3 tens and 4 ones. By drilling these patterns, you're helping your child develop the automaticity they need before tackling regrouping and two-digit addition with unlike place values.
Many second graders add the tens digit and ones digit separately, treating them as independent problems instead of one combined number. For example, they might solve 24 + 10 by adding 2 + 1 to get 3, then writing 34, when they actually think of it as 3 tens and 4 ones. Another common error is ignoring the ones place entirely and only adding tens, so 24 + 20 becomes 40 instead of 44. Watch for students who count up by ones instead of recognizing the tens pattern—if they're reciting "24, 25, 26...34" for 24 + 10, they haven't yet internalized that you can jump by tens. These students need to see and hear the place value language: "2 tens and 4 ones, plus 1 ten more, equals 3 tens and 4 ones."
Play a quick mental math game at home or in the car using numbers within your child's range. Call out a number like "35" and ask your child to add 10, 20, or 30 mentally and say the answer aloud without paper. Celebrate quick responses—speed builds confidence. You can make it concrete by referencing toy prices from a toy store: "A toy costs 25 dollars. If you add 10 more dollars to your piggy bank, how much do you have?" This real-world connection helps children see why this skill matters beyond the worksheet.