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This Subtracting Multiples Of 10 drill has 40 problems for Grade 1. Flamingos theme. Answer key included.
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Max spotted 80 flamingos scattered across the lagoon! He must reunite them by tens before sunset arrives.
Standard: CCSS.MATH.1.NBT.C.6
Subtracting multiples of 10 is a foundational skill that helps first graders understand how our base-10 number system works. When children learn to subtract 10, 20, or 30 from a number, they're not just solving math problems—they're building mental math flexibility that makes all future arithmetic easier. This skill appears constantly in real life: if you have 45 stickers and give away 10, how many remain? These quick calculations develop number sense and confidence. At ages 6-7, students are developing the abstract thinking needed to recognize patterns, like how 35 - 10 and 45 - 10 follow the same rule. Mastering this skill reduces counting-on-fingers dependence and prepares children for two-digit subtraction with regrouping in later grades.
Many Grade 1 students incorrectly subtract from the ones place instead of the tens place. For example, when solving 34 - 10, they might write 24 instead of 24 because they subtract from the 4 ones rather than the 3 tens. Another common error is miscounting backwards by tens, especially when regrouping is needed or when the answer crosses a decade boundary. Watch for students who recount everything instead of recognizing the pattern—this indicates they haven't yet internalized that only the tens digit changes. You can spot this by asking them to explain their thinking aloud.
Create a simple "flamingo counting" game at home using any toy collection: lay out 35-45 small objects and ask your child to remove groups of 10 repeatedly, asking "How many left now?" After removing 10, pause and have them say the new number aloud before removing the next 10. This concrete, hands-on repetition helps them see the pattern without relying on worksheets. Do this for just 5 minutes, 2-3 times a week—short, playful practice builds automaticity faster than longer drills.