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. 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
- 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
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
