Algebraic Thinking
When I was young, I was (and still am) a lover of Algebra, so
I want algebraic thinking to only involve letters, equations and solving for
one answer. However this is not the case, as I have moved on in my math career
and into teaching my thoughts on algebraic thinking have grown, matured and
have changed. Algebraic thinking typically means for me looking for patterns and
relationships. It allows for generalizations to be made about something,
putting an equation or rule in place. I also think that algebraic thinking
means taking some abstract concept and putting a face on it, or applying some type
of rule. It is similar to other forms of mathematical reasoning because it
challenges the student to think critically and provides a certain level of
understand (some more than others). Algebraic thinking differs from other forms
of mathematical reasoning like deductive reasoning. Deductive reasoning takes
known facts and makes a conclusions.
My students most use algebraic thinking when they see a
concept for the first time. I usually start each unit out with some type of
investigation. For example I gave my students many graphs of polynomial functions.
I asked them to find some type of relationship or pattern between the number of
zeros and the degree of the polynomial. This allowed for many conversations to
take place, they had to develop some sort of rule to explain why a 4th
degree polynomial can’t have 5 roots, but a 5th degree polynomial
can have 4 roots. It took a little while for each group to sort through the
graphs and come to some type of generalization. I think that this type of thinking
paid off in the long run because I did not just give them the rule and memorize
it, but figuring it out by themselves.
I imagine that algebraic reasoning can mean problem solving,
justifying and proving. I am currently struggling with my students and their
constant question of “why do I need this in real life?” In real life most of my
students are not going to have to solve a quadratic equation by factoring or
multiply rational expressions, but they will need to problem solve. The problem
solving skills and thought process to answer the questions will help with real
life problems. Being able to figure out what the “problem” states, what
resources you have and what you need, setting up a way to solve the problem,
actually doing it and then checking to see if you are right can translate into
most careers.
Math and the skills used in the math classroom (algebraic thinking
and all methods of mathematical reasoning) all us to “sharpen” our critical
thinking skills for us to use later on in life when we are given a problem that
we do not know how to solve right away. We can use our algebraic thinking
skills that were learned in a math classroom to overcome the problem. Algebraic thinking also does not always have
to be for the math classroom or on a homework problem. Anything that calls for
problem solving or making generalizations will use algebraic thinking.