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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Dancers theme. Answer key included.
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Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that helps second graders recognize number patterns and build mental math fluency. At ages 7-8, children are developing number sense and beginning to see that 20 + 30 is really just "2 tens plus 3 tens," which equals 5 tens. This foundation makes later addition with larger numbers far less intimidating—imagine a group of dancers moving in formations of 10, where they can count by tens instead of by ones. When students master this skill, they stop relying on counting on their fingers and start thinking strategically about numbers. This builds confidence and prepares them for two-digit addition with regrouping in Grade 3. Practicing these patterns repeatedly helps cement the tens place as a meaningful unit, not just a digit.
Many second graders add the tens digits but forget to write the zero at the end, writing 3 + 5 = 8 instead of 30 + 50 = 80. Others confuse place value and add across the digits incorrectly, like treating 20 + 30 as "2 + 3" without considering tens at all. You'll spot this error when a child writes answers like 5 or 23 instead of 50. The best check is to ask, 'Are you adding tens or ones?' and have them count by tens aloud to verify their answer.
At the grocery store or home, ask your child to help 'count the bags by tens'—point to 2 bags of apples, then 3 bags of oranges, and ask 'How many bags altogether? Count: 10, 20... 10, 20, 30.' Then write it as 20 + 30 = 50 on a notepad. This concrete, tangible experience ties the abstract numbers to real groups of 10 and makes the pattern stick better than worksheet practice alone.