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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Sunflowers theme. Answer key included.
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Max discovered hungry beetles eating petals! He must collect groups of ten seeds before the beetles return.
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that helps second graders understand place value and build mental math fluency. When children master 20 + 30 or 50 + 40, they're learning that the ones place stays the same and only the tens place changes—a concept that makes later addition and subtraction far easier. This skill directly supports the Common Core expectation that students can fluently add and subtract within 100. Beyond worksheets, this ability lets kids count money, skip-count by tens (like petals on a sunflower), and solve word problems independently. By practicing these patterns, students develop number sense that carries into multiplication and division in third grade. Strong mental math with multiples of 10 also boosts confidence: kids feel capable when they can quickly answer 60 + 20 without counting on their fingers.
Many second graders mistakenly add the tens digits and forget to write zero in the ones place, writing 7 instead of 70 for 30 + 40. Others confuse the operation entirely and subtract instead of add, or they revert to counting by ones (1, 2, 3...) rather than trusting the tens pattern. You'll spot these errors when a student hesitates on every single problem or produces answers like 34 + 50 = 84 instead of 84. The key red flag is inconsistency: if they get 20 + 30 = 50 correct but then answer 20 + 40 = 24, they haven't internalized the pattern yet and need concrete practice with base-ten blocks or bundled straws before moving to abstract problems.
Use a dollar-bill game at home: give your child a pile of play bills in tens ($10, $20, $30, $40, $50). Call out addition problems like 'You have two $20 bills—how much do you have?' and let them count or add the bills physically. This real-world anchor makes the abstract pattern stick because kids see that $20 + $30 is the same as counting two dimes and three dimes. Rotate roles so your child gets to ask you the problems, which deepens their understanding through teaching. Play for just 5 minutes two or three times a week—short, frequent practice is more powerful than one long session.