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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Smoothies theme. Answer key included.
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Max discovered the blender broke! He must combine fruit batches by tens to save the grand smoothie opening today!
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 23 + 10 or 45 + 20, they're developing a crucial shortcut that makes all future addition faster and more confident. This skill bridges concrete counting strategies and abstract place-value thinking—exactly where most seven- and eight-year-olds are developmentally ready to leap forward. By recognizing that adding 10, 20, or 30 just means moving one, two, or three tens, students learn to think about numbers in chunks rather than counting by ones. This foundation makes word problems, multi-digit addition, and even subtraction feel manageable. Real-world contexts—like combining groups of coins, tracking playground game scores, or measuring ingredients for smoothies—suddenly become problems kids can solve mentally rather than on their fingers.
The most common error is that students add the tens digit incorrectly when carrying over—for example, writing 24 + 20 = 44 instead of 44. They often ignore the ones place entirely and just manipulate the tens, or they revert to counting on by ones because mental math still feels unsafe. Watch for students who write the answer in the ones column when they should be updating the tens place. You can spot this by asking, 'Does 24 + 20 feel bigger than 24?' If they hesitate or seem unsure, they haven't yet grasped that the ones stay the same.
Play a 'number jump' game: stand together and say a starting number aloud (like 15), then take giant steps forward while adding 10 each time (15, 25, 35, 45). Have your child call out or write down the sequence. This kinesthetic approach helps them see the pattern—only the tens digit changes—and makes the abstract rule concrete. Repeat with different starting numbers so they notice the pattern holds every time.