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iRubric: Talk and Text Plans Rubric

iRubric: Talk and Text Plans Rubric

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Talk and Text Plans Rubric 
Rubric Code: XX888BC
By jessykaufmann
Draft
Public Rubric
Subject: Math  
Type: Project  
Grade Levels: 6-8

Powered by iRubric Mathematical Practices
  Poor

10 pts

Fair

20 pts

Good

25 pts

Reason abstractly

Abstracts numbers from Talk and Text Plan A:
represents the problem algebraically, solves
the problem, and correctly notes the meaning
of the results in context of the problem.
Poor

Work is missing representations of the problem
or understanding of the constraints of the
problem given in the context.
Fair

Work includes representations of the problem
indicating the student made sense of the
problem and advanced towards a correct
solution, but indicates a struggle to interpret
parts of the context correctly.
Good

Work includes representations of the problem
indicating the student made sense of the
problem, chose an appropriate strategy, and
advanced towards a correct solution
Model with Mathematics

Uses an algebraic method to solve for the
minutes shared (preferably substitution but can
convert to Standard Form and use elimination).
Graphs both equations using slope-intercept
form to determine the cost for both plans when
using 300 minutes. Identifies solution to be
where the lines intersect and expresses it as an
ordered pair
Poor

Write equation incorrectly (two or more
conceptual errors).
Fair

Representations of the problem is written incorrectly. Possibly as an inequality or misses representing 100 free
minutes, or monthly cost, or text cost in
the equation.
Good

Expresses Talk and Text Plan A as an
equation
Use appropriate tools strategically

A graph paper is used for part c to determine
the cost of both talk and text plans for 300
minutes. The graph is used to estimate an
answer for part d.
Poor

Fails to solve Part II algebraically.
OR
Uses evaluation or a table.
OR
Several computational and/or
conceptual errors show in the algebraic
work.
Fair

Possibly combines like terms
incorrectly or fails to use the
distributive property accurately. Algebraic work shows computational
errors.
Good

Solves algebraically for minutes using
the substitution method (or can use the
elimination method). Uses the
distributive property, combines like
terms, and uses inverse operations to
solve for minutes.
Attend to precision

Correctly uses the distributive property,
combines like terms, and applies inverseoperations to solve for minutes. Correctly sets
up graph. Accurately labels work and uses
correct math terminology.
Poor

Student doesn’t use a graph to
determine the cost for the shared minutes. Or Doesn’t label work or use correct math
terminology.
Fair

Error in graphing each line at the
origin and not the y-intercept. Uses slope and y-intercept incorrectly
when graphing.
Good

Correctly uses the distributive property,
combines like terms, and applies inverse
operations to solve for minutes. Correctly sets up graph. Accurately labels work and uses
correct math terminology




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