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This Subtracting Multiples Of 10 drill has 40 problems for Grade 2. Groundhog Day theme. Answer key included.
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Max discovered ten baby groundhogs lost in the burrow! He must solve each subtraction problem to reunite them before hibernation starts.
Standard: CCSS.MATH.2.NBT.B.5
Subtracting multiples of 10 is a foundational skill that builds your child's number sense and mental math confidence. At age 7-8, second graders are developing the ability to see numbers as groups of tens and ones, which is essential for all future multi-digit math. When a child can quickly compute 45 - 10 or 73 - 30, they're practicing place value understanding and preparing for two-digit subtraction with regrouping. This skill also appears in real-world situations—like figuring out how much money remains after buying something, or counting backward by tens during games. Mastering subtraction with multiples of 10 creates a bridge between simple facts and more complex operations, making math feel logical rather than mysterious. Students who develop fluency here gain the confidence to tackle harder problems independently.
Many second graders mistakenly subtract the 10 from every digit rather than just the tens place. For example, they might solve 45 - 10 as 35 instead of 35 because they subtract 1 from both the 4 and the 5. Another common error is forgetting that the ones digit stays the same when subtracting only tens. Watch for students who count backward by ones instead of jumping back by tens, which is slower and more error-prone. If you see answers like 42 - 20 = 20 instead of 22, your child likely needs a visual reminder using base-ten blocks or a number line.
Use a real shopping scenario at home: write down a price (like $67) and ask your child to figure out how much money they'd have left after spending $10, $20, or $30. Let them use coins or a homemade number line on paper to show their thinking. This makes the pattern concrete—they'll notice the tens digit changes but the ones stay put—and it feels like a real decision, not a worksheet. Repeat this weekly with different starting amounts to build speed and confidence.