## Master the GMAT--Math Review: Number Forms, Relationships, and SetsPeterson's provides an in-depth review of the number forms, relationships, and sets problems in the Quantitative Section of the GMAT. Percents, fractions, decimal, ratios, proportion problems, mean, median, mode, range, standard deviation, and geometric and arithmetic sequence examples and explanations are included. |

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### Contents

DECIMAL PLACE VALUES AND OPERATIONS | 1 |

SIMPLE PERCENT PROBLEMS | 3 |

PERCENT INCREASE AND DECREASE | 4 |

RATIOS AND PROPORTION | 7 |

ALTERING FRACTIONS AND RATIOS | 10 |

RATIOS WITH MORE THAN TWO QUANTITIES | 11 |

PROPORTION PROBLEMS WITH VARIABLES | 12 |

ARITHMETIC MEAN MEDIAN MODE AND RANGE | 13 |

GEOMETRIC SEQUENCES | 18 |

ARITHMETIC SEQUENCES | 20 |

PERMUTATIONS | 21 |

COMBINATIONS | 22 |

PROBABILITY | 23 |

SUMMING IT UP | 30 |

ABOUT THE AUTHOR | 31 |

STANDARD DEVIATION | 16 |

### Common terms and phrases

20 The correct Altering fractions answer choice answer is D Arithmetic mean simple arithmetic sequence arithmetic-mean formula cherry candy combining fractions constant multiple correct answer correct responses cross-product method decimal places decimal point decrease determine the number divide equivalent decimal number evenly spaced example Find a percent four numbers fraction’s value geometric sequence geometric series GMAT question Here’s individual probabilities integers mean simple average missing number number of combinations number of decimal number of permutations number of possible number of students number of terms number you multiply numerator and denominator objects original number ounces Percent change percent sign place value plug-in strategy Probabilities involving probability of selecting probability questions problem algebraically question might ask randomly ratio of freshmen selecting a cherry sequence of numbers set of numbers shortcut simplify sixth term standard deviation student twice students are sophomores test makers three numbers total number whole number Z’s share