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This Subtracting Multiples Of 10 drill has 40 problems for Grade 2. Moon Landing theme. Answer key included.
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Max's spaceship lost 10 oxygen units per minute — subtract fast to save the stranded astronauts before takeoff!
Standard: CCSS.MATH.2.NBT.B.5
Subtracting multiples of 10 is a cornerstone skill that bridges your child's understanding of place value with fluent mental math. At ages 7-8, students are developing the ability to see numbers as groups of tens and ones, which makes problems like 45 - 20 feel much simpler than they would otherwise. This skill builds confidence because once children grasp that subtracting 10, 20, or 30 only changes the tens place, they realize they don't need to count on their fingers or struggle with larger numbers. When your second grader can quickly solve 67 - 30, they're not just memorizing facts—they're internalizing how our base-10 number system works. This foundational understanding directly supports subtraction with regrouping later and makes word problems involving money, measurement, and everyday situations feel manageable. The automaticity gained here also frees up mental energy for multi-step problems and more complex thinking.
The most common error is students subtracting from the ones place instead of the tens place—for example, answering 53 - 20 = 35 by only changing the ones digit. Another frequent mistake occurs when children try to count backward by ones instead of recognizing they can count backward by tens, leading to slow, error-prone work and frustration. Some students also confuse the direction of subtraction or misalign numbers vertically, losing track of place value. You'll spot these errors if your child writes answers that don't make sense (like getting a larger number after subtracting) or takes an unusually long time to solve simple problems.
Create a simple 'tens counter' at home using a cup of dimes and pennies or a paper ten-frame. Have your child start with a quantity like 67 cents (6 dimes and 7 pennies) and physically remove 2 dimes, watching the total drop to 47 cents. Do this 3-4 times during snack time or a short 5-minute activity—the tactile, visual connection helps lock in the pattern that only the tens place changes. This mimics the real-world use of money and makes the abstract concept concrete for this age group.