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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Samurai theme. Answer key included.
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Max must collect 50 golden coins scattered across the samurai fortress before the gate closes at sunset!
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 confidence. When children master 23 + 10 or 45 + 20, they're learning that we can decompose numbers into tens and ones—a foundational concept for two-digit addition and subtraction. This skill also makes real-world math faster: counting money, tracking points in games, or organizing objects by tens becomes automatic rather than laborious. At ages 7-8, students are developing the abstract thinking needed to see that 10 + 10 = 20 follows the same pattern as 10 + 10 apples. Fluency with multiples of 10 reduces cognitive load, freeing up mental energy for solving more complex problems. A samurai warrior masters the basics before attempting advanced techniques—similarly, your child needs this foundation solid before tackling three-digit addition or regrouping strategies.
Many second graders mistakenly add the tens and ones digits separately without holding place value, writing 34 + 20 = 54 as 3 + 2 = 5, then 4, creating 54 instead of 54 (which happens to be correct here, but the reasoning breaks down). More commonly, students confuse the process and write 34 + 20 = 55, adding the ones digit of 20 as if it were a full digit. Watch for children who count by ones instead of tens—if they're tallying 34, 35, 36... instead of 34, 44, 54, they haven't internalized the pattern yet. You can spot this by asking them to explain their strategy aloud.
Play 'Money Adds' at home using dimes and pennies: give your child a pile of pennies (representing ones) and dimes (representing tens). Say a two-digit number like 27, have them build it, then add another dime or two dimes and ask what the new total is. This tangible, repeated practice shows why only the dimes pile grows. Do this for 5–10 rounds once or twice a week, and the pattern will click much faster than worksheet repetition alone.