MULTIPLYING FRACTIONS

1. Multiply numerator X numerator (NO COMMON DENOMINATOR)

2. Make mixed number a improper fraction

3. cross reduce or simplify

4. same signs answer is positive/different signs answer is negative

Multiplicative Inverse/Reciprocal

*always keep your sign the same and flip your number

DIVIDING FRACTIONS

Don’t divide; you multiply by the reciprocal…

1.     change division sign to multiplication

1. flip the second part of the problem…never the first!

EQUATION RULES:

ADDING/SUBTRACTING EQUATIONS

Inverse operation means “undo”

*get variable by itself

*do opposite of what is being done

*if subtracting you must add the opposite

Multiplication Equations

Divide by the number that is with the variable on both sides of the equation (equals sign)

*Opposite signs answer is negative.

1.         either add or sub (use opposite sign/same #)

2.  Divide by # with variable (don’t change the number or sign)

When solving for answer:

*same signs= positive

*different signs= negative

PRIME/COMPOSITE NUMBERS:

Prime #’s:  greater than one, has exactly 2 factors, 1 and itself

Ex. 2,3,5,7,11,13,17,19

Composite #’s:  greater than one, has more than 2 factors

Ex. 4,6,8,9,10,12,14,15,16,18

#’s 0 and 1:  are neither prime or composite

Add/Subtract Fractions

1. Find a common denominator(preferably LCD).

2. Multiply numerator by the same number you multiplied denominator.

3. Use sign of larger number  (might need to borrow)

4. Simplify