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# My GMAT Stack

### Study cards

Question | Answer |
---|---|

What are the Properties of 0? | Zero is an even integer. Zero is neither positive nor negative. Zero is a multiple of every number. Zero is a factor of no number. |

What is the square root of 2? | = 1.4 |

What is the Square root of 3? | = 1.7 |

What is the Area of a Trapezoid? | ((sum of bases)(height))/2 |

Standard Deviations of n Numbers | 1. Find arithmetic mean 2. Find differences between mean and each of the n numbers. 3. Square each of the differences. 4. Find avarage of squared differences. 5. Take non-negative square root of this average. |

1. Odd + odd = 2. Even + Even = 3. Odd + Even = | 1. Even 2. Even 3. Odd |

1. Odd X Odd = 2. Even X Even = 3. Odd X Odd = | 1. Odd 2. Even 3. Even Any multiplication involving an even number creates an even product. |

What is Gross? | Is the total amount before any deductions are made. |

What is Net? | is the amount after deductions are made. |

Percentage to know: 1/8% | = 12.5% |

Percentage to know: 1/6% | = 16.6% |

Percentage to know: 5/6% | = 83.3% |

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Brntcolby