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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Explorers theme. Answer key included.
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Max found ancient map pieces scattered across the jungle! He must add them up before the explorer rivals arrive.
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that builds your second grader's number sense and prepares them for multi-digit addition. At ages 7-8, children are developing the mental math strategies they'll rely on throughout elementary math, and mastering tens helps them recognize patterns in our base-10 number system. When students can quickly add 20 + 30 or 40 + 50, they're not just memorizing facts—they're learning that 2 tens plus 3 tens equals 5 tens, which deepens their understanding of place value. This skill makes real-world math feel manageable: counting money, measuring distances, or tracking scores. Students who grasp this concept gain confidence with larger numbers and set themselves up for success with two-digit addition and subtraction. This worksheet gives your child focused practice to fluency, so tens become automatic rather than something they have to count on their fingers.
The most common error is when students add the tens digits but forget to include the zero. For example, they'll see 20 + 30 and write 5 instead of 50, treating it like 2 + 3. You might also see them counting by ones instead of by tens: touching their fingers and saying "21, 22, 23" all the way to 50 rather than "one ten, two tens, three tens, four tens, five tens." Watch for papers where they add correctly but then write the answer without the zero at the end—that's a place-value slip, not a conceptual misunderstanding, but it needs gentle correction.
Play a quick grocery store game at home: show your child items priced at multiples of 10 (or use toy prices you write down: 20¢, 30¢, 40¢) and ask "If we buy this 20¢ item and this 30¢ item, how much money do we spend?" Let them count by tens on their fingers if needed at first, but encourage them to say "20 plus 30 is 50" without counting. Two minutes of this real money context once or twice a week reinforces the pattern far better than extra worksheets and keeps the skill anchored to something tangible.