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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 )

Proportions
Proportions are an extension of ratios. Proportions are equations that set two ratios equal to one another and are
helpful to determine ratios when quantities in a specific ratio relationship increase or decrease. 
If Nathan has 7 sodas and 4 bottles of water, proportions tell us that if Nathan has 14 sodas,
he would have 8 bottles of water. This proportion can be expressed as: 14 
_ = 
 
7 _
8
4


4
Decimals
A decimal, like a fraction, expresses a part of a whole. Decimals are tested often on the GRE and it is important to
understand the fundamentals of a decimal, including how the specific digits of the decimal are described. Take the decimal
123.456, for example. Each digit has its own mathematical label:
1 2 3 . 4 5 6
1: Hundreds
3: Ones
5: Hundredths
2: Tens
4: Tenths
6: Thousandths
115


ARGOPREP.COM/GRE
Fractions to Decimals 
You may occasionally need to change either the expressions in the problem or your answer from fractions to decimals
or decimals to factions. Remember that unless otherwise specified, a decimal or fraction that are equivalent are
acceptable for numeric entry questions. 
To change a fraction to a decimal, simply divide the denominator into the numerator. 


20 = 7 ÷ 20 = 0.35 
Decimals to Fractions
Suppose you have the decimal 54.67. To convert a decimal to a fraction, first remove the decimal point and make the
resulting whole number your numerator and, for right now, make 1 your denominator:
54.67 = 5467 
_
1
Then, count the number of digits after the decimal point. In this case, .67 follows the decimal point. So, two digits
follow the decimal point. Place a 0 after the 1 in the denominator for each digit that occurs after the decimal point
in order to determine the fractional equivalent to your decimal.
54.67 = 5467 
_
100
In order to verify that you have the correct fraction, simply divide the denominator into the numerator-
-you will end up right back at 54.67.



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