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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Galaxy theme. Answer key included.
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Max discovered stranded aliens on five distant planets. He must collect food bundles of 10 to save them!
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that helps second graders build number sense and mental math fluency. When children master 20 + 30 or 50 + 40, they're learning that tens are units they can count and combine, just like ones. This understanding forms the foundation for two-digit addition, which appears across nearly every elementary math standard. At ages 7–8, students are developing the ability to think about numbers in groups rather than just individual units, a cognitive leap that makes place value concrete. By practicing these combinations, children gain confidence and speed with number bonds they'll use for the rest of elementary school. The galaxy of math facts becomes much easier to navigate when students can quickly add tens without counting on their fingers.
The most common error is students treating the tens digit and ones digit separately but incorrectly—for example, writing 20 + 30 = 50 but then adding an extra 0 to get 500. Another frequent mistake happens when children count by ones instead of recognizing the tens pattern: they'll count "20, 21, 22..." instead of "20, 30, 40." You'll spot this if a student takes much longer than expected or writes down every number. A third pattern is reversing the digits in the answer or forgetting the zero entirely, writing 5 instead of 50.
Play a quick grocery store game at home: show your child items with prices ending in zero (like $10, $20, $30) and ask how much two items cost together. Let them use real money or draw coins to show their thinking. This anchors adding multiples of 10 to something tangible—they're combining real dollar amounts—and keeps the zeros meaningful rather than abstract. Do this for 5–10 minutes once or twice a week, letting your child lead the pace.