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parentheses first. Exponents: Next, calculate any  exponents



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GRE by ArgoPrep GRE Prep 2018 14 Days Online Comprehensive Prep Included Videos Practice Tests GRE Book 2018-2019 GRE Prep by ArgoPrep ( PDFDrive )

parentheses
first.
Exponents:
Next, calculate any 
exponents.
Multiplication/Division:
Then attack 
multiplication
and 
division
elements from left to right.
Addition/Subtraction:
Finally, attack 
addition
and 
subtraction
elements from left to right.
Not all equations will contain all these elements. However, be sure to still follow the order when attacking the elements
that are present. 
Let us look at an example:
100 − 4(7 − 4)3 
First, solve for the values in the parentheses
100 − 4(3)3 
Solve (7 − 4) and replace the value in parentheses with 3
100 − 4(3)3 = 100 - 4(27) 
Solve the exponent


100 - 4(27) = 100 − 108 
Multiply and divide
100 − 108 = −8 
Solve addition and subtraction elements
The final answer is −8. Remember to work equations in the proper order and that multiplication, division, addition, and
subtraction should be solved from left to right. 
111
ARGOPREP.COM/GRE
Absolute Value 
Absolute value is the distance of a number from zero. The value is always expressed as a positive number. Absolute
value is symbolized by a number being enclosed in two vertical bars. 


|12| 
The absolute value of a positive number is always just the number itself. 
|12| = 12 
The absolute value of a negative number is derived by dropping the negative sign in front of the number.
|−14| = 14 
You may see absolute value appear in a number of ways on the exam, including as expressions where you must solve
for a value. Here’s an example: 
4 − 2 + |5 − 7| =
|5 − 7| = |−2| = 2
Solve what is in the brackets
4 − 2 + 2 = 4
Plug in the value to the rest of the expression and solve
Fractions 
Now, let us look at a subset of rational numbers, namely fractions and ratios. 
There is no shortage of fractions on the GRE. You will see them appear in word problems, as part of algebraic expressions,
and in pure problem solving questions. The two main components of a fraction are the numerator and the denominator. 
a


→ numerator
 
b
→ denominator 
You will need to know how to perform various operations with fractions, including addition, subtraction, multiplication,
division, simplifying, and converting them to mixed numbers. Let us look at some of the key facts about fractions and
operations related to them. 
Reciprocals
The reciprocal of a fraction is found simply by reversing the numerator and the denominator. For example, the
reciprocal of 2 
_3 is 3 _2. The product of any fraction and its reciprocal is always 1. All whole numbers except zero have a
reciprocal where the reciprocal of
a
is 1 
a
_.

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