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This Subtracting Multiples Of 10 drill has 40 problems for Grade 2. Skateboarding theme. Answer key included.
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Max must collect 80 scattered skateboard tricks before the competition starts this afternoon!
Standard: CCSS.MATH.2.NBT.B.5
Subtracting multiples of 10 is a cornerstone skill that builds number sense and prepares second graders for larger subtraction problems. When children master this concept—like solving 45 − 20 or 67 − 30—they're learning that tens and ones can be handled separately, which dramatically simplifies mental math. This skill directly supports the Common Core expectation that Grade 2 students fluently subtract within 20 and work with place value to solve problems within 100. At ages 7–8, students' brains are developing the abstract thinking needed to see 30 as "3 tens" rather than just a number, making this the perfect time to cement these strategies. Strong performance here predicts success with two-digit subtraction and eventually with regrouping. Beyond worksheets, this skill shows up whenever children count money, track scores in games like skateboarding competitions, or figure out how many items are left after giving some away.
The most common error is students subtracting the tens digit from the wrong place—for example, answering 35 − 20 as 15 instead of 15, or confusing 50 − 30 with 5 − 3. Another frequent mistake is students forgetting that the ones digit stays the same when subtracting multiples of 10; they may compute 48 − 20 as 28 because they miscounted or didn't anchor the 8. Watch for students who count backward by ones instead of jumping back by tens—they'll work much slower and make careless errors. If a child consistently gets the tens correct but changes the ones, they haven't yet internalized that tens and ones are separate.
Create a simple game using two ten-frames drawn on paper or a whiteboard. Show your child a two-digit number (like 56), have them draw or place counters in the frames, then ask them to "remove one frame" (subtract 10). Do this 3–4 times in a row, each time asking, "What changed—the tens or the ones?" After they notice the pattern, repeat with subtracting 20 or 30. This tactile, visual repetition helps them see that tens peel away cleanly without touching the ones—a concrete foundation for the abstract skill.