Mathematical Processes 
Work meets standard of excellence 
Work meets standard of proficiency 
Work meets acceptable standard 
Work does not yet meet acceptable standard 
Problem Solving 
I choose efficient and
effective strategies when applying addition and subtraction skills to solve the problem
I show flexibility and insight when solving the problem, adapting if necessary

I choose workable and reasonable strategies when applying addition and subtraction skills to solve the problem
I show thoughtfulness when solving the problem 
I choose partially appropriate and workable strategies when applying addition and subtraction skills to solve the problem
I show understanding when solving the problem 
I choose inappropriate and/or unworkable strategies when applying addition and subtraction skills to solve the problem
I attempt to solve problem 
Reasoning 
I often draw out insightful and logical conclusions and recognize inappropriately drawn conclusions without prompting 
In many situations, I draw out logical conclusions and recognize inappropriately drawn conclusions when prompted 
I sometimes draw out simple, logical conclusions and sometimes recognize inappropriately drawn conclusions when prompted 
I rarely draw conclusions from a mathematical situation and usually do not recognize inappropriately drawn conclusions 
Communication 
I use effective and specific mathematical language, symbols, and conventions to enhance communication about adding and subtracting twodigit numbers 
I use appropriate and correct mathematical language, symbols, and conventions to support communication about adding and subtracting twodigit numbers 
I use mathematical language, symbols, and conventions to partially support communication about adding and subtracting twodigit numbers 
I use mathematical and nonmathematical language and conventions
incorrectly and/or inconsistently, which interferes with communication about adding and subtracting twodigit numbers 