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The square root of a number is best described by the question:
What number has been squared to get the number under the square root symbol?
The key will find the square root of whatever is in the display on your calculator.
The square root of 4, , is 2. That means that if 2 is squared, it will equal 4.
Every number has a square and a square root. Here are some examples of square roots:
The variables in the last three examples show another rule of math:
The square root of a number squared is the number.
For example: or = 2.
Square root practice: Find the square root for each of the following numbers.
Use the key. Round off to 4 decimal places.
(1) 1 (7) 74.525
(2) 11 (8) 35 7/8
(3) 54.5 (9) a^2
(4) 16 3/4 (10) b^2
(5) 400 (11) 144
(6) 127 (12) 100
On to Right Triangles
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9 September 1995
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