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This Subtracting Multiples Of 10 drill has 40 problems for Grade 1. Helicopters theme. Answer key included.
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Max's helicopter fuel tank has 80 gallons — he must subtract by tens to land safely before the storm!
Standard: CCSS.MATH.1.NBT.C.6
Subtracting multiples of 10 is a gateway skill that helps first graders recognize patterns in our number system and build confidence with larger numbers. When children subtract 10, 20, or 30 from numbers like 45 or 67, they're learning that the ones place stays the same—only the tens place changes. This mental math skill makes everyday situations easier: a child might have 50 cents and spend 10 cents, or a parent might say "we have 80 stickers and gave away 20." By mastering this pattern, students develop number sense and lay a foundation for addition and subtraction strategies they'll use throughout elementary school. Strong pattern recognition at this age also supports flexible thinking and reduces math anxiety as numbers grow larger.
The most common error is when children subtract from both the tens and ones places, treating the problem like regular column subtraction. For example, with 35 - 10, they might compute 3 - 1 = 2 and 5 - 0 = 5, getting 25 instead of 25—though that worked, or they'll incorrectly compute 34 - 10 as 24 when it should be 24. Watch for students who don't "see" that only the tens digit moves. Another pattern to catch: kids who lose track of which number is being subtracted and reverse it (saying 40 - 20 = 60 instead of 20). Ask them to point to or circle which pile is being taken away to anchor their thinking.
Play a quick "helicopter takeoff" game at home: tell your child you have toy helicopters lined up (use coins, blocks, or drawings). Say "We have 50 helicopters. 10 fly away. How many are left?" Start with amounts like 30, 40, and 50, always subtracting 10 or 20. Let your child physically move or remove items while saying the number out loud. This concrete, hands-on approach—with the real-world image of things leaving—makes the pattern stick much faster than worksheets alone.