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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Math Heroes theme. Answer key included.
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Max discovered ten magical crystals hidden throughout the tower—he must add them by tens before the spell breaks!
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that helps second graders see patterns in our number system and build toward fluency with larger numbers. When children understand that 20 + 30 = 50, they're learning that tens can be added just like ones—a critical conceptual leap. This skill makes mental math faster and easier, reducing reliance on counting on fingers. In everyday life, kids encounter multiples of 10 constantly: counting coins, measuring in groups of ten blocks, or tracking points in games. Mastering this concept now builds confidence for two-digit addition and subtraction, where regrouping tens becomes essential. Students who can quickly add multiples of 10 develop number sense that supports all future multiplication and place-value work, making them true math heroes in their own learning journey.
Many second graders add the tens digits but forget to write the zero at the end, writing 5 instead of 50 for 20 + 30. Others struggle because they haven't internalized that 2 tens + 3 tens equals 5 tens, not 23 or 32—they're treating the problem like single-digit addition. Watch for students who revert to counting by ones (1, 2, 3...) rather than counting by tens (10, 20, 30...). The clearest sign is when a child solves 20 + 10 correctly but then struggles with 40 + 20, showing the skill hasn't generalized.
Play a quick game during grocery shopping or a walk: collect items in groups of 10 (ten rocks, ten sticks) and have your child add groups aloud: 'One group of 10 plus another group of 10 equals 20.' Then show two price tags under $1 ending in zero and ask, 'If this costs 30 cents and this costs 40 cents, how much altogether?' This concrete, playful approach helps seven- and eight-year-olds connect the abstract math on the worksheet to the real counting they can actually see and touch.