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# 5th Grade EDM Unit 1

### Number Theory

Term | Definition |
---|---|

Commutative Property of Multiplication | a property of multiplication that two numbers can be multiplied in either order without changing the product |

composite number | a counting number greater than 1 that has more than two factors |

divisibility rule | a test to determine whether a counting number is divisible by another counting number without actually doing the division |

even number | a counting number that is divisible by 2 |

odd number | a counting number that is not evenly divisible by 2 |

exponent | a small raised number used to tell how many times the base is used as a factor |

exponential notation | a way of representing repeated multiplication by the same factor |

factors | each of the two or more numbers in a product |

factor pair | two factors of a counting number "n" whose product is "n" |

factor rainbow | a way to show factor pairs in an organized list of all of the factors of a number |

factor string | a counting number written as a product of two or more of its counting-number factors other than 1 |

product | the result of multiplying factors; the answer in a multiplication problem |

Name Collection box | a diagram that is used for collecting equivalent names for a number |

number model | a number sentence, expression, or other representation that models a number story or situation |

prime factorization | a counting number written as a product of prime-number factors |

prime number | a counting number greater than 1 that has exactly two whole-number factors: 1 and itself |

quotient | the result of dividing one number by another number; the answer in a division problem |

rectangular array | an arrangement of objects in rows and columns that form a rectangle |

remainder | an amount left over when one number is divided by another number (r or R) |

square array | a rectangular array with the same number of rows and columns |

square number | numbers that are the product of a counting number multiplied by itself |

square root | a number that multiplied by itself is "n"; the factor which multiplied by itself gives a square number product |

unsquaring | to find the square root |