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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Escape Room theme. Answer key included.
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Max discovered mysterious number codes on the library door—he must solve every adding problem to unlock his escape!
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 mental math fluency. When children recognize that 20 + 30 = 50 follows the same logic as 2 + 3 = 5, they're developing deep number sense rather than memorizing isolated facts. This skill is essential for real-world situations like counting money (dimes), measuring in tens, and solving two-digit addition problems without always needing to count on fingers. At ages 7–8, students' brains are ready to spot these patterns, and mastering multiples of 10 gives them confidence and speed in math. It also lays the foundation for place value understanding, which is critical for multiplication, division, and multi-digit computation in later grades. Students who can quickly add multiples of 10 move through word problems and daily math tasks with less frustration and greater independence.
Many second graders add the tens digit and forget the zero, writing 30 + 40 = 7 instead of 70. Others confuse the process by treating 30 + 40 as 3 + 4 = 7, then randomly appending a zero without understanding place value. Watch for students who count by ones instead of by tens, or who lose track after a few counts and guess. You can spot this by asking them to explain *why* 20 + 30 = 50—if they can't connect it to the tens, they're likely relying on rote memory rather than number sense.
Play a simple counting game at home using dimes or drawn circles in groups of 10. Give your child a starting amount (like 30 cents or 30 objects) and ask, 'If I add 20 more, how many do we have?' Let them group and regroup physically before writing the number sentence. This hands-on approach helps them see that we're really just counting tens, making the abstract equation concrete and memorable for this age group.