# mathematical usage

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1. a negative multiplied or divided by a negative equals a
• positive number
•
• example: -3*-4 = 12; -6/-3 = 2
2. a negative multiplied by a positive equals a
a negative number

example: -3*4 = -12; -6/3 = -2
3. with a integer treat a negative sign
just like a subtraction sign

example: 3+-2 = 3 - 2 or 1
4. a negative number subtracted from another number is the same as

example: 2- -1 = 2+1 = 3
5. remember that you can reverse the numbers while

example: -4+2 = 2+ -4 = 2-4 = -2
6. what is a prime number
a number that can only be divided evenly by itself or one
7. two negatives equal
a positive
8. subtracting a negative number is the same as
9. multiplying or dividing two negative numbers yields a
positive product or quotient
10. when only one of the terms in a multiplication or division product is negative, the resulting product or quotient will be
negative
11. composite numbers will have
at least three factors: themselves, one, and some other number
12. order of operations
please excuse my dear aunt sally
13. to add or subtract fractions you must have a
common denominator
14. to multiply fractions
multiply the numerators together and then multiply the denominators together
15. to divide one fraction by another
invert the second fraction and then multiply first numerators and then denominators
16. exponents. when two terms with the same base are multiplied together