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Summary Complete GRE Math questions and answers
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Complete GRE Math questions and answers
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Complete GRE Math questions and answersformula for distance problems - distance=rate×time or d=rt
The Perimeter of a rectangle - P=2(l+w)
The Perimeter of a Square - P=4s (s=side)
Area of a Parallelogram: - A=(base)(height)
(x-y)(x+y) - x²-y²
(x-y)² - x²-2xy+y²
(x+y)² - x²+2xy+y²
An Angle that's 180° - Straight Angle
The sum of all angles around a point - 360°
,Complete GRE Math questions and answers
If a pair of parallel lines is cut by a transversal that's not perpendicular, the sum of
any acute angle and any obtuse angle is - 180
Acute Angle an angle that is less than 90°
Obtuse Angle:angle that is greater than 90° but less than 180°
Distance - (rate)(time) d=rt
Rate - d/t (distance)/(time)
Time - (distance)/(rate) d/r
How do you solve proportions?
a/b=c/d - Cross multiplication
a/b=c/d
4/6=10/15
4(15)=6(10) 60=60
If a lamp increases from $80 to $100, what is the percent increase? - = 25%.
= (actual increase/original amount) x 100%
,Complete GRE Math questions and answers
= 20/80 x 100% = 1/4 x 100% = 25%
The percent decrease of a quantity - = (actual decrease/Original amount) x 100%
If a lamp decreases to $80, from $100, what is the decrease in price? - = (actual
decrease/Original amount) x100%
= 20/100x100% = 20%
To increase a number by x% - multiply by 1+x%
i.e. 100 x (1+50%)=100x1.5=150
To decrease a number by x% - multiply by 1-x%
i.e. 100 x (1-50%)=100x.5=50
THE DENOMINATOR CAN NEVER - BE ZERO! 1/∅=null
If a>b then - -a<-b
The reciprocal of any non-zero number is - 1/x
, Complete GRE Math questions and answers
Probability of an Event - P(E) = number of favorable outcomes/total number of
possible outcomes
If Event is impossible - P(E) = ø
If E is certain - P(E) = 1/1 = 1
Probability of Event all cases - ∅≤P(E)≤1
Probability of E not occurring: - 1 - P(E)
Circumference of a circle - pi(diameter)
Circumference of a circle - 2(pi)r
Area of a circle - (pi)r²
Volume of a rectangular solid - (length)(width)(height)
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