Max Rescues the Circus Animals: Subtract by Tens!

About this Grade 2 Subtracting Multiples Of 10 Drill

Subtracting multiples of 10 is a critical stepping stone that bridges your child's understanding of place value with efficient mental math. At ages 7-8, students are moving beyond counting on their fingers and learning to work with tens and ones as complete groups—a foundational concept for all future multiplication and division work. When children can quickly solve problems like 45 - 20 or 67 - 30, they're building number sense and confidence with larger numbers. This skill also makes real-world math faster and easier: calculating change at a store, figuring out how many minutes remain in an activity, or managing small quantities of classroom materials (much like the props and equipment a circus performer might track). Mastering this pattern now prevents the struggle many students face with subtraction in later grades.

What your student will practice

• Subtract multiples of 10 from two-digit numbers using tens and ones place value
• Apply the pattern that subtracting tens only affects the tens digit
• Use place value reasoning to solve subtraction problems mentally
• Build fluency and speed with subtracting multiples of 10 accurately

Common mistakes to watch for

Many Grade 2 students mistakenly subtract 10 from the ones place instead of the tens place—answering 45 - 20 as 43 instead of 25. You'll spot this error when they line up the problem incorrectly or when they subtract the '2' from the '5' in the ones column. Another common pattern is reversing the operation: writing 45 - 20 = 65 by accidentally adding instead of subtracting. Ask your child to show you which digit changed and why; this reveals whether they understand that only the tens column is affected.