OAS 5.A.2.3 (Oklahoma, 5th Grade): "Evaluate expressions involving variables when values for the variables are given." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.
Algebraic Reasoning & Algebra (A)5.A.2 Understand and interpret expressions, equations, and inequalities involving variables and whole numbers, and use them to represent and evaluate real-world and mathematical problems.5.A.2.3Evaluate expressions involving variables when values for the variables are given.