**NOTATION:** **2/3** division (instead
of 2÷3)

**(2)(3)** multiplication (instead
of 2x3)

**2 3** 2 is less than or equal to
3

**2 3** 2 is greater than or equal
to 3

**| 15 | **absolute value of 15 ( |-15|
= + 15)

i summation = the sum of all Xi where i goes from j to k.

** ^{j=1}** (j usually starts
at 1.)

A. Fraction to decimal conversion

4/10 = .40 Take 4 and divide it by 10.

1. addition--same sign: Add absolute values of numbers and give answer of common sign.

2. addition--unlike sign: Get difference between numbers and give answer in sign of larger number.

+2 | -2 | -3 | +4 | +4 | +3(+2) | = 6 |

+3 | -3 | +2
| -3 | +3 | -3(-2) | = 6 |

+5 | -5 | -1 | +1 | +7 | -3(+2) | = -6 |

C. Solving a complex expression--guidelines:

1. Do the math within parenthesis first, beginning with most interior parenthesis.

2. Do exponents. (Do all the math under a square root before taking the square root).

3. Do all math in the numerator, then
do the denominator, __then__ divide (do not try to cancel).

4. Unless stated otherwise, students will
be expected to minimally work as accurately as 1/1000th range
and round their answers to the 1/100th or to two decimal points.

*** In statistics always
use the positive square root.**