GRE Quantitative

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Fraction > Decimal: 1/1000

0.001

Fraction > Decimal: 1/600

0.001666....

Fraction > Decimal: 1/100

0.01

1/40

0.025

Fraction > Decimal: 1/20

0.05

Fraction > Decimal: 1/10

0.1

Fraction > Decimal: 1/9

0.11111.....

Fraction > Decimal: 1/8

0.125

Fraction > Decimal: 1/6

0.16667

Fraction > Decimal: 1/5

0.2

Fraction > Decimal: 1/4

0.25

Fraction > Decimal: 3/8

0.375

Fraction > Decimal: 2/5

0.4

Fraction > Decimal: 1/2

0.5

Fraction > Decimal: 3/5

0.6

Fraction > Decimal: 5/8

0.625

Fraction > Decimal: 2/3

0.66667

Fraction > Decimal: 3/4

0.75

Fraction > Decimal: 7/9

0.7777....

Fraction > Decimal: 4/5

0.8

Fraction > Decimal: 5/6

0.83333.....

Fraction > Decimal: 7/8

0.875

Finding GCF

1. Factor both #'s 2. Find the highest power of 2 both #'s have in common. 3. Find highest power of 3 both have in common 4. Find highest power of 4 both have in common 5. Multiply the common factors (with their exponents) to get GFC.

Finding LCM

1. Find GCF. 2. Divide GCF from both numbers. 3. Multiply the GCF by both multiples found above. or... use [LCM= (P x Q)/GCF]

Equation for percent *increase*:

1. m = 1 + (p% as decimal) 2. m x initial price = new increased price

Equation for percent *decrease*:

1. m = 1- (p% as decimal) 2. m x initial price = new decreased price

First 15 perfect squares

1=1 2=4 3=9 4=16 5=25 6=36 7=49 8=64 9=81 11=121 12=144 13=169 14=196 15=225

Prime numbers less than 20:

2, 3, 5, 7, 11, 13, 17, 19

Prime numbers between 20 and 60:

23, 29, 31, 37, 41, 43, 47, 53, 59

Circumference of a circle

2πr

Pythagorean triples

3-4-5 5-12-13 7-24-25 8-15-17

Area of a circle formula

A=πr²

Divisiblity Rules for 2:

All even #'s are divisible by 2. Check to see if last digit is even.

Total Area of a Cylinder

Area = 2πrh + 2πr²

Add or subtract "likes", we get an _____ number.

EVEN

Multiplying even and odds: As long as there is at lease ONE even factor in a product, the product will be ____.

EVEN

Divisiblity Rules for 4:

If the last two digits (one's and ten's place) form a 2-digit # that is divisible by 4, then the entire # is divisible by 4.

Divisiblity Rules for 3:

If the sum of the digits is divisible by 3, then the number is divisible by 3. Ex: with 135; 1 + 3 + 5 = 9. Since 9 is divisible by 3, that means 135 is also divisible by 3.

Divisiblity Rules for 9:

If the sum of the digits is divisible by 9, then the number is divisible by 9. Ex: with 1296; 1 + 2 + 9 + 6 = 18. Since 18 is divisible by 9, that means 1296 Is also divisible my 9.

Lateral Area of a Cylinder

LA = 2πrh

If sequential percent changes.... find multiplier for each percent change, then _____ all multipliers.

Multiply

Divisibility Rules for 6:

Must be an even number and sum of digits is divisible by 3. Ex: with 1296; 1 + 2 + 9 + 6 = 18. Since 18 is an even # and divisible by 3, then 1296 must be divisible by 6.

Add or subtract "unlikes", we get an ____ number.

ODD

Divisiblity Rules for 5:

Only if last digit is 0 or 5, it is divisible by 5.

PROFIT equation

Profit = Revenue - Cost

Total surface area of rectangular prism

SA = 2hw + 2hd + 2wd

Total surface area of cube

SA = 6s^2

True or false.... NEVER double round. Ex of double rounding: 6.48 > 6.5 > 7

True. Instead... 6.48 > 6

Volume of a rectangular prism

V = L x W x D

Volume of a cube formula

V=s^3

Volume of a Cylinder Formula

V=πr²h

Equation for arc length

arc length/2πr = angle/360

Area of a sector

area of sector/πr^2 = angle/360 or area of sector = angle/360 x πr^2

Terms: "is" means ____ "of" means ____

is = equal of = multiply

Sign rules for division: Same sign =____ different sign = ____

same = positive different = negative

Sign rules for multiplication: Same sign = ____ Different sign = ____

same = positive different = negative


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