Flashcards
GRE
Cards in this deck (28)
- 1Percent to decimalsDivide by 100 - move decimal points 2 places to the LEFT
- 2Decimals to PercentsMultiply by 100
Move decimal point two places to the RIGHT - 3Percents to FractionsPut the percent over 100 and then simplify if we needed
- 4Fraction to Percent1. Change to decimal
1. Then move decimal point two spots to the RIGHT - 5Approximation on a test PercentsMultiply the deniomneter to make it closer to 100
- 6"IS"=
- 7"of"Multiply
- 8MultiplierDecimal Form
- 9How to approach "What is 80% of 200?"1. Change percent to multipler form
2. Replace unknown with a variable - 10240 is 30% of what Number in algebraic terms?(240) = (0.30)*(X)
- 11Approach for Percent increase and DecreaseUse multiplier
- 12Percent IncreaseWhole Original part + "XX" more
ex: Increase by 30%
1+0.30= 1.3 - 13Percent Decrease1 - (P% as a decimal)
Ex: 1 - (0.70) = 0.30 - 14Finding the Percent when both values are givenMultiplier= new value/old value
- 15With Sequential Percent Change NEVERAdd or subtract percents
- 16Simple InterestInterest payment same each time
- 17Compound InterestPrinciple + all previous interest payments
- 18formula for Compound InterestA=P(R^y)
P -Principle
R - Multiplier
Y- Years - 19Ratioa fraction compare part to whole or part to part
- 20Ratios approach1) Scale fractor
2) Proportions - 21Combining Ratios - Common elementWith a common element you want to make it equal by finding a common multiple
- 22DivisibilityInteger Properties
- 23Divisibility Rules - 2Even # means divisible by two
Look at the last digit of the number - 24Divisibility Rule -5Last digit 5 or 0
- 25Divisibility Rules - 4Last two digit for a number if divisible by 4, then the entire number is divisible by 4
- 26Divisibility Rules - 3 *Add up all the digits of the number if the sum of the digits is divisible by 3, then entire number is divisible by 3
- 27Divisibility Rules - 9Add all digits and see if divisible by 9
- 28Divisibility Rules - 6Must be:
a) divisible by 2
b) divisible by 3