Fill-in-the-Blank Sums Answer Key

This worksheet provides thirty problems where students must determine the missing addend or total. Each horizontal equation has a blank box, encouraging analytic thinking as learners use inverse operations to find the correct value. This format supports understanding of number relationships and reinforces addition fact families. Students build confidence applying reasoning skills while improving numerical fluency. This worksheet is excellent for strengthening conceptual understanding as well as speed.

Curriculum Matched Skills

Mathematics – Understanding Addition and Missing Addends

Mathematics – Algebraic Thinking Foundations

Mathematics – Addition Within 20

Mathematics – Reasoning About Number Relationships

This worksheet is part of our Addition Mad Minute Worksheets collection.