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Ontario Tech acknowledges the lands and people of the Mississaugas of Scugog Island First Nation.

We are thankful to be welcome on these lands in friendship. The lands we are situated on are covered by the Williams Treaties and are the traditional territory of the Mississaugas, a branch of the greater Anishinaabeg Nation, including Algonquin, Ojibway, Odawa and Pottawatomi. These lands remain home to many Indigenous nations and peoples.

We acknowledge this land out of respect for the Indigenous nations who have cared for Turtle Island, also called North America, from before the arrival of settler peoples until this day. Most importantly, we acknowledge that the history of these lands has been tainted by poor treatment and a lack of friendship with the First Nations who call them home.

This history is something we are all affected by because we are all treaty people in Canada. We all have a shared history to reflect on, and each of us is affected by this history in different ways. Our past defines our present, but if we move forward as friends and allies, then it does not have to define our future.

Learn more about Indigenous Education and Cultural Services

How do I use my scientific calculator?

It’s important to point out that each scientific calculator is a little different with regards to placement of certain keys as well as order of entry of keystrokes.

First, let’s start off with some basic operations, then move onto examples you can try with your scientific calculator.

Most calculators today have the following operations, which you need to know how to use:


What it means


plus, or addition


minus or subtraction Note: there is a DIFFERENT key to make a positive number into a negative number, perhaps marked (-) or NEG (for "negation")


times, or multiplied by


over, or divided by

yx or ^

raised to the power (for exponents)

Sqrt or    

square root


"exponentiate this," or raised to the power

LN or ln

natural logarithm, or "take the log of"


sine function


cosine function


tangent function


inverse sine function, arcsine, or "the angle whose sine is"


inverse cosine function, arccosine, or "the angle whose cosine is"


inverse tangent function, arctangent, or "the angle whose tangent is"

( )

parentheses, or "do this first"

Scientific vs. Business Calculator

Enter the following expression into your calculator exactly as written and hit the “ENTER” or “=” key; you should obtain 41.

5 + 4 * 9 
If you do not get 41, you do not have a scientific calculator that correctly evaluates mathematical expressions, and you will find it of little use in your science, mathematics, or engineering classes.

Working with Powers (Exponents)

When working with exponents, be sure to use the “yx ” or “^ ” key. "e" is that very special number (approximately 2.71828) which arises so often that it has been pre-programmed in your scientific calculator. Let’s try some examples:

To do 26, for most calculators, we punch the three keys “2 yx 6” or “2 ^ 6” (if your calculator has the yx, it might use the opposite order; i.e., “6 yx 2”). You may have to use the “SHIFT” or “2nd” function key in order to use the “yx ” or “ ^ ” key. We always punch the “ENTER” or “=” key to obtain our answer. Be sure to get the answer 64. If you’re in a test and you don’t remember the order in which to enter the numbers, don’t panic: just try the operation on something simple such as 23. You should obtain 8. 

To do e6, for most calculators, we punch the two keys “ex 6” (some calculators use the opposite order; i.e., “6 ex”). You may have to use the “SHIFT” or “2nd” function key in order to use the “ex” key. Be sure to get the approximate answer 403.42879.