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This Subtracting Multiples Of 10 drill has 40 problems for Grade 2. Volleyball theme. Answer key included.
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Max's teammates are trapped in the gym! He must solve subtraction problems to unlock each exit door before time runs out!
Standard: CCSS.MATH.2.NBT.B.5
Subtracting multiples of 10 is a foundational skill that helps second graders develop mental math fluency and number sense. When students can quickly compute problems like 45 - 10 or 67 - 30, they're building the mental strategies they'll need for all future subtraction, including multi-digit problems in third grade and beyond. At ages 7-8, children's brains are ready to recognize patterns—and multiples of 10 are perfect for this. This skill also makes everyday math faster and more confident: calculating change at a store, figuring out how many minutes until recess, or tracking a volleyball team's score across multiple games. Mastering this concept moves students from counting on their fingers to thinking in tens, a critical shift toward true mathematical thinking.
Many second graders subtract multiples of 10 incorrectly by treating the tens and ones places as separate problems rather than one connected number. For example, with 53 - 20, a student might subtract 2 from 5 and get 33, forgetting that 20 means two tens. Watch for answers where both digits change when only the tens digit should shift. Another common error is miscounting backward by tens, especially when the ones digit is high—students might lose track after three or four steps and land on the wrong number.
Create a simple skip-counting game using household items: line up 10 pennies or blocks in a row, then ask your child to remove 10 (or 20, 30) and count what remains. Call out starting numbers between 30 and 70, have them remove a multiple of 10, and say the new total aloud. Do this for 5 minutes twice a week—the repetition locks in the pattern of "the tens change, the ones stay the same" without feeling like a math lesson. Kids this age thrive on quick, predictable games with immediate feedback.