Addition Completion Problems

This worksheet includes thirty addition problems where one addend or the total is missing. Students must use reasoning skills and knowledge of number relationships to determine the correct value. The format encourages students to think flexibly, using strategies such as fact families, counting on, and inverse operations. With a wide selection of sums up to twenty, learners strengthen both conceptual understanding and fluency. The worksheet works well for reinforcing problem-solving strategies in addition.

Curriculum Matched Skills

Mathematics – Algebraic Thinking: Missing Addends

Mathematics – Addition Fact Fluency

Mathematics – Mental Computation Strategies

Mathematics – Number Sense Reasoning

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