Students manipulate expressions into different equivalent forms as they expand, factor, add, and subtract numerical and algebraic expressions and face authentic real-world, multi-step problems.
In Unit 3, seventh-grade students bring several prior skills together to manipulate expressions into different equivalent forms. In the preceding unit, students operated and reasoned with positive and negative rational numbers. In this unit, they use these new skills to expand, factor, add, and subtract numerical and algebraic expressions. Students pay particular attention to the structure of expressions in order to better understand what an expression means and how it can be manipulated (Standard for Mathematical Practice 7). Students also face authentic real-world, multi-step problems that require strategic use of rational numbers and estimation where appropriate.
In sixth grade, students learned how the same rules that govern arithmetic also apply to algebraic expressions. They learned to expand and factor expressions using the distributive property, and they combined terms where variables are the same. With new knowledge of the number system, students go from working with expressions like $${5(6x+3y)}$$ in sixth grade to those with rational numbers such as $${-(a+b)-\frac{3}{2}(a-b)}$$ in the seventh grade.
The next seventh-grade unit, Unit 4, Equations and Inequalities, will continue to engage students in working with expressions with rational numbers. In eighth grade, students will work with expressions and equations in both one variable and two variables, solving single linear equations and systems of linear equations. Throughout all of their future work with expressions, students’ ability to look for and make use of the structure in expressions will be as important as their ability to work with them procedurally.
Pacing: 15 instructional days (11 lessons, 3 flex days, 1 assessment day)
For guidance on adjusting the pacing for the 2020-2021 school year due to school closures, see our 7th Grade Scope and Sequence Recommended Adjustments.
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order of operations
expand an expression
factor an expression
combine like terms
coefficient
commutative property
distributive property
numerical expression
algebraic expression
greatest common factor (GCF)
constant term
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rectangular arrays
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Rectangular array |
Example: $$\frac{1}{3}(9x-12y-18)=3x-4y-6$$ |
This assessment accompanies Unit 3 and should be given on the suggested assessment day or after completing the unit.
7.NS.A.3
7.EE.A.1
Evaluate numerical expressions with rational numbers using the order of operations.
7.NS.A.3
7.EE.A.1
Write and evaluate expressions for mathematical and contextual situations.
7.EE.A.1
Expand and factor expressions using the distributive property and the greatest common factor.
7.EE.A.1
Expand and factor expressions with negative rational numbers.
7.EE.A.1
Add and simplify expressions by combining like terms.
7.EE.A.1
Subtract and simplify expressions.
7.EE.A.1
Simplify expressions by combining like terms and using the distributive property and properties of operations (Part 1).
7.EE.A.1
Simplify expressions by combining like terms and using the distributive property and properties of operations (Part 2).
7.EE.A.2
Write and interpret expressions in different ways to shed new meaning on a context.
Key: Major Cluster Supporting Cluster Additional Cluster
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