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This Subtracting Multiples Of 10 drill has 40 problems for Grade 1. Eco Warriors theme. Answer key included.
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Max discovered 80 trapped animals! He must free them by tens before the storm arrives tonight.
Standard: CCSS.MATH.1.NBT.C.6
Subtracting multiples of 10 is a cornerstone skill that helps first graders recognize patterns in our number system and build mental math confidence. When children subtract 10, 20, or 30 from larger numbers, they're learning that the ones place stays the same while only the tens place changes—a discovery that feels like a secret code! This skill directly supports their ability to handle money (coins and bills), tell time on clocks, and solve word problems independently. At age 6-7, students are developing working memory and logical thinking, and practicing these subtractions strengthens both. Mastering this pattern gives young learners a genuine sense of mathematical power, preparing them for two-digit subtraction in later grades. Whether counting down snack portions or organizing supplies like eco-warriors tidying up a classroom, this skill appears everywhere in their daily world.
Many first graders incorrectly subtract from the ones place instead of the tens place, turning 35 − 20 into 35 − 2 = 33. Others accidentally change both digits, writing 15 − 10 = 04 or 05 instead of 05. You'll spot this pattern if a child is getting most problems wrong by exactly 8 or 9, or if their answers have random ones digits. Ask the child to show you with base-ten blocks or draw circles and lines to reveal whether they're touching the wrong part of the number.
Create a simple "money game" at home using real dimes and pennies. Give your child a pile of dimes and a few pennies (like 4 dimes and 3 pennies = 43 cents), then ask "If we spend 2 dimes, how many cents are left?" Let them physically remove the dimes and count. This concrete action—watching the pennies stay put while dimes disappear—locks in the pattern that ones don't change. Play this for 5 minutes a few times a week, and you'll see the lightbulb moment happen naturally.