## Common Core State Standards for Mathematics

Grade(s) 6 resources related to the following standard:
Expressions and Equations
Apply and extend previous understandings of arithmetic to algebraic expressions.
2. Write, read, and evaluate expressions in which letters stand for numbers.
c. Evaluate expressions at specific values of their variables. Include expressions that arise from formulas used in real-world problems. Perform arithmetic operations, including those involving wholenumber exponents, in the conventional order when there are no parentheses to specify a particular order (Order of Operations). For example, use the formulas V = s³ and A = 6 s² to find the volume and surface area of a cube with sides of length s = 1/2.

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This customizable iOS app (\$) provides practice with a variety of mental math skills. Users roll or drag marbles through a maze collecting numbers that satisfy given challenges. Each of the three levels of difficulty offers a range of skills that may be selected. The game rewards accuracy and includes obstacles and bonuses that increase the motivational value.
Activity, Interactive Media, Mobile App
Grade Level: 1, 2, 3, 4, 5, 6+
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This pair of videos (8 min and 10 min) and accompanying text illustrate various strategies for providing mental skills practice that is brief, interesting, useful, and effective. They include examples of teachers working with their students in group settings as well as narrative elaboration by Paul Goldenburg. Two related articles (Practice and Fact of the day) are cataloged separately.
Activity, Instructional Strategy, Reference Materials, Article, Video
Grade Level: 1, 2, 3, 4, 5, 6+
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This animated PowerPoint lesson demonstrates how to substitute the value of a variable in place of the variable's symbol in an algebraic expression, and presents the concept of solving an equation for an unknown variable value.
Demonstration
Grade Level: 5, 6+
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