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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Drones theme. Answer key included.
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Max's delivery drones crashed in the warehouse! He must collect all 10 drones by adding tens before they lose power.
Standard: CCSS.MATH.1.NBT.C.4
Adding multiples of 10 is a cornerstone skill that helps first graders develop number sense and mental math fluency. When children can quickly combine groups of 10—like 20 + 30 or 40 + 10—they're building the foundation for all future addition and subtraction. This skill teaches students to recognize patterns in our number system and shows them that numbers can be broken into manageable chunks. At six and seven years old, children are developing their ability to think about quantities in groups rather than always counting by ones, which is a major cognitive leap. By mastering multiples of 10, students gain confidence and speed, making them more flexible problem-solvers. They'll use this skill constantly in second grade and beyond, and it also helps them understand money, measurement, and skip-counting—all things they encounter in real life.
The most common error is when students revert to counting by ones instead of thinking in tens. For example, they might count 1-2-3-4-5 instead of recognizing that 20 + 30 means 2 tens plus 3 tens equals 5 tens, or 50. Watch for a child who solves 10 + 20 by putting up fingers and counting from 1, or who writes down tick marks. Another frequent mistake is misplacing the zero—writing 5 instead of 50, or confusing 30 + 20 with 32 + 20. If you see hesitation or slow counting on every problem, the child hasn't yet internalized the tens pattern.
Create a simple tens-frame game at home using small objects like buttons, coins, or crackers in groups of 10. Make two piles (say, 20 items in one pile, 30 in another), then ask your child, 'How many groups of 10 do we have altogether?' This concrete, playful approach reinforces that tens can be combined just like single items, and it naturally connects to how drones or toy vehicles might be organized in groups for delivery. Repeat with different combinations so the pattern becomes automatic.