Horizontal Addition Facts Answer Key

This worksheet provides students with horizontal equations involving the addition of eight and nine to various single-digit numbers. Students must compute each sum mentally and record the answer in the blank box. The horizontal layout encourages learners to use mental addition strategies rather than relying on vertical stacking. Repeated practice with +8 and +9 facts helps strengthen fluency, pattern recognition, and arithmetic confidence. The worksheet is structured to build speed and precision, which are essential skills for later multi-digit operations. Its consistent format makes it suitable for warm-up activities, independent practice, or skill review.

Curriculum Matched Skills

Mathematics – Single-Digit Addition Fluency

Mathematics – Mental Math Strategies

Mathematics – Number Patterns and Relationships

Mathematics – Addition Within 20

This worksheet is part of our Addition Facts With 8 and 9 Worksheets collection.