Your Computer's Calculator  
This page has two purposes  to explain the mathematics of square roots and to explain how to use the calculator to obtain the exact root or an approximation of the root. Two sets of background material gets you ready for this task  the math definitions and vocabulary and other calculator functions or buttons.
To review the math, visit: Powers of Ten, powers, principal root, square, square root, radical, radical sign, and radicand. Keep both notes open and your calculator open. Use your CALCULATOR Button to view an picture of the computer's calculator. 
The Square Root  
Compute mentallly the square roots in the first two examples. Then, use your computer's calculator to complete each example so you see how the calculator works.

"A Horse of A Different Color"  
"A Horse of A Different Color" is an expression used in a situtation in which, though one knows a great deal about one situtation, the situation at hand is different enough to be thought of as a completely different situation.
What this means is this calculator can not "speak" all languages humans use when they do math. This calculator can not preform the required work  it is not made for this purpose. A scientific or graphing calculator which uses complex numbers is required. 
Another Example: "Someone's Using the Upstairs John"  
You know ... "Someone's Using the Upstairs John"  the high pot in use  the hypotenuse  that thing with the Pythagorean Theorem. You can probably complete this example mentally. See how much more work is required when the calculator does the arithmetic.

The OneHalf Power  
Square and square root are inverse operations  one undoes the other. The exponential notation, or powers, used to indicate each are deliberately reciprocals of each other. 



Next we expand the list of some of the powers of two so that the onehalf powers are also included.


So, raising a number to the onehalf power means taking its square root. Next, return to pg 7 of FINALLY PLEASE READILY EXCUSE MY DEAR AUNT SALLY!, Order of Operations. 
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