Grade 3 - Patterns and Relations
Standard 3.PR.4 - Practice using addition and subtraction to solve for a variable.
Included Skills: Mixed Equations, Algebra
Solve one-step addition and subtraction equations involving a symbol to represent an unknown number. • Explain the purpose of the symbol in a given addition or subtraction equation with one unknown; e.g., in the equation 3 + ? = 10, the triangle represents the number that would make the equation true. • Create an addition or subtraction equation with one unknown to represent a given combining or separating action. • Provide an alternative symbol for the unknown in a given addition or subtraction equation. • Solve, using manipulatives, a given addition or subtraction equation with one unknown that represents combining or separating actions. • Solve a given addition or subtraction equation with one unknown, using a variety of strategies, including guess and test. • Solve a given addition or subtraction equation when the unknown is on the left or the right side of the equation. • Explain why the unknown in a given addition or subtraction equation has only one value.