Solve-the-Sum

This printable math worksheet is designed to help students in Grades K-1 strengthen addition fluency and number reasoning by working with equations where the sum is given and one addend plus 3 must be determined. This structure encourages students to think flexibly about addition, moving beyond simple computation to understanding how equations can be rearranged.

Learning Goals

• Addition with Provided Sums (Grades K-1)
  Practice finding a missing addend when the total is already known.
• Reverse Addition Reasoning
  Strengthen understanding that addition can be worked forward and backward.
• Fact Fluency for +3
  Reinforce automatic recall of +3 facts through varied equation formats.
• Mental Math & Flexibility
  Encourage students to manipulate numbers mentally and reason through relationships.

Instructional Benefits

• Teacher-Created Resource
  Designed to align with early elementary math standards and conceptual learning goals.
• Conceptual Focus
  Helps teachers assess whether students understand addition as a relationship, not just a process.
• Horizontal Equation Format
  Supports mental computation and flexible thinking.
• Flexible Classroom Use
  Ideal for guided instruction, small groups, intervention, independent practice, or assessment.

This Solve the Sum worksheet helps students build number sense, logical reasoning, and confidence with addition. By solving equations with provided sums, learners strengthen their understanding of how addition works-supporting future success with subtraction, fact families, and early algebraic thinking.

This worksheet is part of our Addition Facts With 2 and 3 Worksheets collection.