Max Escapes the Ninja Tower: Subtract Tens Quest

About this Grade 1 Subtracting Multiples Of 10 Drill

Subtracting multiples of 10 is a cornerstone skill that helps first graders understand how our number system works in groups of tens. When children master 45 - 10 or 60 - 20, they're not just doing arithmetic—they're building mental math flexibility that will carry them through multiplication, division, and place value work for years to come. At ages 6 and 7, kids are developing the ability to see numbers as collections rather than single units, and this skill directly supports that cognitive leap. In daily life, this shows up when a child counts money (losing a dime), tracks toys in groups, or helps with simple shopping math. By practicing these problems, students develop confidence in manipulating tens and ones separately, which is exactly what strong mathematicians do. This worksheet gives them the repetition and pattern recognition their growing brains need to make the connection automatic.

What your student will practice

• Subtract multiples of 10 from two-digit numbers with accuracy
• Recognize and apply the pattern that subtracting 10, 20, 30 keeps ones digits unchanged
• Build fluency and speed with facts involving tens
• Transfer understanding to real-world scenarios with groups of ten

Common mistakes to watch for

The most common error is students changing the ones digit when they shouldn't. For example, a child might solve 37 - 10 and write 26 instead of 27—they've subtracted from both the tens and ones place. Watch for this pattern across multiple problems. Another frequent mistake is students counting backward by ones instead of using the tens pattern (saying 37, 36, 35... down to 27). You'll spot this if they're slow and seem to be working much harder than peers, or if they lose track partway through. The third red flag is reversing the operation—writing the answer as if they added 10 instead of subtracted it.