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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Lemonade Stand theme. Answer key included.
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Max's lemonade stand is packed with customers! He must count all the dimes quickly before the ice melts.
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. At seven and eight years old, children's brains are developing the ability to recognize patterns, and multiples of 10 (10, 20, 30, 40, and so on) are among the most predictable patterns in our number system. When students master adding by tens—like 24 + 20 or 35 + 10—they're learning that we can break numbers into tens and ones, a foundational concept for all future multiplication and division work. This skill also makes real-world math faster and easier: calculating change at a lemonade stand, combining groups of items, or estimating costs becomes automatic rather than laborious. Students who can quickly add multiples of 10 gain confidence in their math abilities and develop the strategic thinking that separates rote counting from genuine mathematical reasoning.
Many second graders incorrectly add multiples of 10 by treating the zero as part of the calculation rather than as a placeholder. For example, when solving 23 + 30, they might count "23, 24, 25...33" (adding 10 individual ones) instead of recognizing that they're simply adding 3 tens to get 53. Another common error is regrouping unnecessarily or changing the ones digit when it should stay the same. Teachers and parents can spot this by listening to how students explain their thinking: if they're counting by ones or seem confused about why the ones place didn't change, they haven't yet grasped the tens-and-ones pattern.
Create a simple tens-and-ones sorting activity using household items like coins, buttons, or crackers. Group 10 items into one pile repeatedly, then ask your child to add groups: "We have 2 groups of 10 crackers, plus 5 loose ones. Now add 3 more groups of 10. How many tens do we have now?" This hands-on experience makes the pattern visible and concrete, helping them see that adding tens is like stacking complete groups without touching the loose items left over.