Expressions with unknowns

Home Forums Questions about the standards 6–8 The Number System Expressions with unknowns

This topic contains 1 reply, has 2 voices, and was last updated by  Aaron Bieniek 3 years, 1 month ago.

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  • #3275

    ronistol
    Member

    By the end of the 7th grade, do students need to simplify expressions with unknowns and negative numbers such as 5x-3x=2x ?
    Or do they only need to evaluate numeric expressions without unknowns (5-3=2)?

    #3278

    Aaron Bieniek
    Participant

    Perhaps what you are asking about is mostly contained in 6th grade, in 6.EE.3. Students apply the properties of operations to generate equivalent expressions. In the case you mention, students would use the distributive property to rewrite 5x – 3x as
    (5 – 3)x, and then 2x.

    In grade 7 students build on that in 7.EE.1 by including expressions with rational coefficients.

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