Grade 3 - Patterns and Relations
Standard 3.PR.3 - Practice using addition and subtraction to solve for a variable.
Included Skills: Mixed Equations, Algebra
Solve one-step addition and subtraction equations involving symbols representing an unknown number. • Achievement Indicators - Explain the purpose of the symbol, such as a triangle or a circle, in a given addition and in a given subtraction equation with one unknown. - Create an addition or subtraction equation with one unknown to represent a given combination or separation action. - Provide an alternative symbol for the unknown in a given addition or subtraction equation. - Solve a given addition or subtraction equation that represents combining or separating actions with one unknown using manipulatives. - Solve a given addition or subtraction equation with one unknown using a variety of strategies including guess and test. - Explain why the unknown in a given addition or subtraction equation has only one value.