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This Subtracting Multiples Of 10 drill has 40 problems for Grade 1. Frogs theme. Answer key included.
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Max discovered 80 lily pads floating away! He must subtract by tens to save them before they disappear forever into the pond!
Standard: CCSS.MATH.1.NBT.C.6
Subtracting multiples of 10 is a cornerstone skill that helps first graders build mental math fluency and number sense. When children can quickly solve problems like 45 - 10 or 60 - 30, they're developing the foundation for all future subtraction work. This skill teaches students that we can break numbers into tens and ones, making larger problems feel manageable. At age 6-7, children's brains are ready to recognize patterns—and multiples of 10 follow a beautiful, consistent pattern. Mastering this skill boosts confidence and reduces the need to count on fingers, freeing up mental energy for more complex math. Most importantly, subtracting multiples of 10 appears constantly in real life: managing toy collections, tracking game scores, or helping with simple shopping situations.
Many first graders mistakenly subtract the multiple of 10 from both the tens and ones places—for example, solving 37 - 10 as 27 instead of 27, or computing 52 - 20 as 32 - 20 = 12. This happens because they haven't yet grasped that only the tens digit changes. You'll spot this error when a student gets inconsistent answers on similar problems or when they appear to 'randomly' reduce both digits. Watch for students who recount from the beginning instead of recognizing the pattern; this signals they need more concrete practice with tens and ones physically separated.
Create a simple 'tens-and-ones' activity at home using small objects like pasta, buttons, or coins grouped into piles of 10. Write a number like 48 on paper, have your child build it with 4 tens-piles and 8 ones, then physically remove a tens-pile while saying '48 minus 10 equals 38.' Repeat with different starting numbers and different multiples of 10. This hands-on approach helps six-year-olds see exactly what's happening, turning an abstract rule into something they can touch and understand.