GRE: Math
GRE Math Flashcards  Most Studied  #7,9,10,12 I deleted ones that didn't make sense
Kalvin
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Perfect Squares 1151, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225

How to recognize if a # is a multiple of 12The sum of the digits it a multiple of 3 and the last two digits is a multiple of 4. (i.e 144: 1+4+4=9 which is a multiple of 3, and 44 is a multiple of 4, so 144 is a multiple of 12.)

Area of a rectangleA = length x width

How to recognize a # as a multiple of 9The sum of the digits is a multiple of 9.

Slope given 2 pointsm= (Y1Y2)/(X1X2)

Circumference of a Circlec=2 x pi x r OR pi x D

Area of a circleA=pi*(r^2)

Perimeter of a rectangleP= 2L + 2w

How to recognize a multiple of 6Sum of digits is a multiple of 3 and the last digit is even.

Volume of a rectangular boxV=Lwh

How to recognize a # as a multiple of 4The last 2 digits are a multiple of 4. (i.e 144 .... 44 is a multiple of 4, so 144 must also be a multiple of 4.)

How to recognize a # as a multiple of 3The sum of the digits is a multiple of 3 (i.e. 45 ... 4 + 5 = 9 so the whole thing is a multiple of 3)

Area of a triangleA= (1/2) b*h

When dividing exponential #s with the same base, you do this to the exponents...Subtract them. i.e (5^7)/(5^3)= 5^4

When multiplying exponential #s with the same base, you do this to the exponentsAdd them. i.e. (5^7) * (5^3) = 5^10

First 10 prime #s2, 3, 5, 7, 11, 13, 17, 19, 23, 29 A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself

Find distance when given time and rated=rt so r= d/t and t=d/r

binomial product of (x+y)(xy)x²y²

factored binomial product of (x+y)²x²+2xy+y²

factored binomial product of (xy)²x²2xy+y²

binomial product of (x+y)²(x+y)(x+y)

binomial product of (xy)²(x+y)(xy)

the measure of a straight angle180°

the slope of a line in y=mx+bm

Pythagorean theorema²+b²=c²

If a is inversely porportional to b, what does it equal?ab=k (k is a constant)

#1 What is the relationship between lengths of the sides of a triangle and the measure of the angles of the triangle?The longest side is opposite the largest (biggest) angle.

#3 What is the relationship between lengths of the sides of a triangle and the measure of the angles of the triangle?Sides with the same lengths are opposite angles with the same measure.

If y is directly proportional to x, what does it equal?y/x is a constant

What is a percent?A percent is a fraction whose denominator is 100.

#1 What is an important property of a 306090 triangle?The triangle is a right triangle.

#2 What is an important property of a 306090 triangle?The hypotenuse is twice the length of the shorter leg.

#3 What is an important property of a 306090 triangle?• The ratio of the length of the three sides is x:x√3:2x

The negative exponent x⁻ⁿ is equivalent to what?1/xⁿ i.e. 5^3 = 1/(5^3) = 1/ 125 = .008

formula for area of a triangleA=½bh

formula for volume of a rectangular solidV=l×w×h

formula for the volume of a cubeV=side³

#1 What are the important properties of a 454590 triangle?• The triangle is a right triangle.

#2 What are the important properties of a 454590 triangle?• The triangle is isosceles (AC=BC).

#3 What are the important properties of a 454590 triangle?• The ratio of the lengths of the three sides is x:x:x√2.

formula for distance problemsdistance=rate×time or d=rt

The sum of the angles in a quadrilateral is360°

The sum of the measures of the n angles in a polygon with n sides(n2) x 180

In any polygon, all external angles equal up to360°
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