Open Questions and Differentiation

One of the many goals in mathematics is to help students develop their critical thinking and problem solving skills. Open questioning is a method that can be used by teachers to engage a students inquiry. According to the asking effective questions document from the Ontario Ministry of Education, open questions are effective in supporting learning because they encourage a variety of approaches and responses. Open questions also intrinsically allow for differentiation, as the student responses to the questions will reveal their individual understanding and knowledge of the topic the question is based from. What are the differences between an open question and a traditional question though?

To use arithmetic as an example, a traditional question would be something along the lines of:

What does 5 x 6 = ? 

Students can do their procedural multiplication technique or use a calculator to easily find that the answer is 30 and then move on to the same type of questions using the same procedures over and over.

An example of an open question using this same topic would be something along the lines of:

Using multiplication, find two or more numbers that can multiply to 30.

This question has various answers and requires students to think about how multiplication works and could also even challenge their algebra and division skills as well. An example of some solutions to this open question could include:

1) 5 x 6 = 30
2) 2 x 5 x 3 = 30
3) -15 x -2 = 30

Notice the various complexity of the answers shown here. Answer 1) uses very basic multiplication to find the solution but still shows understanding of how to use multiplication. Answer 2) is a little more complex requiring students to think a little bit about their algebra skills. Lastly, answer 3) not only shows correct multiplication but also shows that two negative numbers multiply together to make a positive number, combining two different topics into one to solve the answer showing critical thinking.

Open questions can even be brought to the high school level and used for more complex problems. For example:

Create a linear function that passes through the y-intercept at the point (0,4). 
Students can come up with a variety of answers:

Figure: Different linear function solutions to an open question.

For this type of question students need to understand that the y-intercept component of their equation will not change, but the slope can be any number. This allows students to explore linear functions and see how manipulating the equation effects the graph of each function.

Overall I believe open questions are an excellent tool for testing student inquiry while also providing differentiating learning which provides great feedback for the teacher on how well students are understanding certain topics.