Teen Number Decrease

This subtraction worksheet provides structured vertical practice subtracting 8 or 9 from teen numbers. Learners compute each difference and record answers in aligned boxes, reinforcing accurate digit placement while strengthening fluency with challenging subtraction facts.

Instructional Objectives

• Skill Focus (Grades 1-2): Subtract 8 and 9 from teen numbers accurately using vertical subtraction.
• Conceptual Understanding (Grades 1-2): Strengthen number sense by recognizing relationships between teen numbers and larger single-digit subtrahends.
• Algebraic Reasoning (Grade 2): Apply counting-back and compensation strategies to subtract efficiently by 8 or 9.
• Curriculum Alignment (Grades 1-2): Supports subtraction within 20, mental math development, vertical processing accuracy, and operational fluency standards.

The repeated structure helps students internalize subtraction patterns involving 8 and 9, improving both speed and confidence. The vertical format supports careful work habits and reduces alignment-related errors.

Learning Benefits

• Builds fluency with advanced single-digit subtraction facts
• Reinforces mental math strategies and number relationships
• Encourages neatness and accuracy in written computation
• Effective for practice, intervention, or skill-building sessions

This printable worksheet provides focused practice that helps students master subtracting 8s and 9s from teen numbers while strengthening number sense, fluency, and confidence.

This worksheet is part of our Subtract by 8s and 9s Worksheets collection.