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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Coding Kids theme. Answer key included.
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Max's robot friend lost all its code numbers! He must collect multiples of 10 before the computer shuts down.
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that helps second graders build number sense and prepares them for two-digit addition without regrouping. When children master this pattern—recognizing that 20 + 30 is just 2 tens plus 3 tens, equaling 5 tens or 50—they develop mental math strategies that make larger calculations feel manageable rather than overwhelming. This skill bridges the concrete understanding of tens and ones that students built in first grade with the more abstract thinking needed for multiplication and division later. In real life, kids use this when combining groups of dimes, thinking about minutes on a clock (which counts by fives and tens), or organizing classroom supplies into bundles of 10. At 7 and 8 years old, students' brains are ready to see patterns and shortcuts, and adding multiples of 10 trains that pattern-recognition muscle. Fluency with this concept also builds confidence—it's one of the first times students realize they can solve problems quickly without counting on their fingers.
The most common error is that students treat multiples of 10 like single-digit problems and add the tens place incorrectly—for example, saying 20 + 30 = 50 but showing their work as 2 + 3 = 5 without realizing they're adding tens. Another frequent mistake is confusing the zero: a student might write 20 + 40 = 60 correctly but then miscount on a number line and land on 50. You'll spot this when a child is slow to answer even simple multiples of 10 or when they revert to counting on their fingers instead of recognizing the pattern. Ask them to explain what the numbers mean using tens—if they can't say "three tens plus two tens," they likely need more concrete practice with base-ten blocks or bundles.
Create a simple "grocery bag" activity at home: gather 10 of something countable (crackers, building blocks, pasta pieces) into small bags or cups, then ask your child to figure out how many items you have if you combine 2 bags and 3 bags. Physically combining the bags before counting helps them see that you're really just combining groups of tens. This mirrors how coding kids think in patterns and sequences—they're learning to recognize that adding tens follows a repeatable rule, just like a program following instructions step by step.