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Page 18
FRACTION TO DECIMAL
One sixteenth of an inch equals .0625 of an inch.
Example: 1 -r 16 a 0.0625
SQUARE AREA
A rug 13.6 feet by 14.6 feet equals 198-56 square feet or 22.062 square yards (9
square feet equal one square yard). See the conversion chart on Page 23 for
converting feet to a decimal.
Example:
13.6 x 14.6 ~ 198.56 square feet
198,56 f 9 - 22.062 square yards
RAISING A NUMBER TO A POWER
A number multiplied by itself will give the square of the number, or the second
power of the number. The square of the number multiplied by the number will
give the cube or the third power of the number and so on.
Example:
15 x 15 = 225 (152)
15 x 15 x 15 = 3375 (153)
SQUARE ROOT OF A NUMBER (trial and error}
This Calculator does not provide a single step method to determine the square
root of all numbers. However, with the following formula the square root of any
number can be determined in about four steps.
Let N represent the number, and A will be your first rough estimate for the
square root. For example, to find the square root of 226f use 226 for N. In the
example above, 15 is the square root of 225, and a good first estimate.
Therefore, let 15 represent A. Substitute the numbers into the formula below
and the result of step 1 will be a closer estimate number to substitute for A in
step 2. Then repeat the process. For step 3, substitute the result of step 2 far A
and so on until the same answer is obtained in two successive substitutions, or
until the answer is judged to be close enough. The closeness can readily be
determined by the "Check" at the end of step 3, by pushing the "X" and "+
keys. This squares the answer. When the same answer is obtained two times in*
row, squaring the number, as above, will show the closest possible answer this
method can produce, which is generally close enough.
H + A
Example:
N - 226, A = 15 in the formula _A_
2
Step 1.
226 4-15 + 15 - 30.066666 * 2 = 15.033333
Step 2.
226 -5-15.033333 + 15.033333 - 30.066592 -5- 2 = 15.033296
Step 3.
226 4-15.033296 + 15.033296 = 30-066592 * 2 = 15.033296
Check:
15.033296 x, = 225.99998
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