Pre- Algebra Test Review

Solving One Step Equations

Always make sure your variables are on one side of the equal sign and constants are on the other side of the equal sign

Inverse Operations- Operations that UNDO each other

• The inverse operation of ADDITION is SUBTRACTION

• The inverse operation of MUTIPLICATION is DIVISION

Multiple Choice

What is the next step to solve this equation?
n - 4 = -2

• Add 4 to both sides of the equation

• Add n to both sides of the equation

• Subtract n from both sides of the equation

• Subtract 4 from both sides of the equation

ADDING INTEGERS

• When adding the same sign, add and keep the sign.

• When adding different signs, find the difference of both numbers and take the sign of the number you have more of.

(-12) + 27 = 

I have an addition sign (that's good).  My numbers have two different signs, so I have to find the difference of 12 and 27.  It is 15.  Now, I have more positives (27) than negatives (-12).  So, my answer is positive.  Answer is 15.

SUBTRACTING INTEGERS

• Do "keep, add, opposite".

• Keep the first number, change minus sign to plus sign, and take the opposite of the second number.

• Use your addition rules.
  

(-17) - 6

Do "keep, add, opposite".  Keep the (-17), change the minus to a plus, and change the 6 to a (-6).  Now, we have (-17) + (-6).  Use addition rules.  We are adding the same sign, so add and keep the negative.  Answer is (-23).

Multiplying and Dividing Integers

• Same Signs= Positive Answer
• Different Signs= Negative Answer