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# Prime/Composite

### These cards have FOUR sides, flip thru them all!

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

21 | 21 : odd, not divisible by 2 | 2+1=3 : Is divisible by 3 | COMPOSITE | COMPOSITE |

0 | NEITHER prime or composite | NEITHER | NEITHER | NEITHER |

8 | 8 : even, divisible by 2 | COMPOSITE | COMPOSITE | COMPOSITE |

9 | 9 : odd, not divisible by 2 | 9 : divisible by 3 | COMPOSITE | COMPOSITE |

15 | 15 : odd, not divisible by 2 | 15 : 1+5=6 , divisible by 3 | 15 : ends in 5, divisible by 5 | COMPOSITE |

17 | 17 : odd, not divisible by 2 | 17 : 1+7=8 , not divisible by 3 | 17 : doesn't end in 0 or 5, not divisible by 5 | PRIME |

39 | 39 : odd, not divisible by 2 | 39 : 3+9=15 , divisible by 3 | COMPOSITE | COMPOSITE |

41 | 41 : odd, not divisible by 2 | 41 : 4+1=5 , not divisible by 3 | 41 : doesn't end in 0 or 5, not divisible by 5 | PRIME |

45 | 45 : odd, not divisible by 2 | 45 : 4+5=9 , divisible by 3 | 45 : ends in 5, divisible by 5 | COMPOSITE |

51 | 51 : odd, not divisible by 2 | 51 : 5+1=6 , divisible by 3 | COMPOSITE | COMPOSITE |

57 | 57 : odd, not divisible by 2 | 57 : 5+7=12 , divisible by 3 | COMPOSITE | COMPOSITE |

62 | 62 : even, divisible by 2 | COMPOSITE | COMPOSITE | COMPOSITE |

67 | 67 : odd, not divisible by 2 | 67 : 6+7=13 , not divisible by 3 | 67 : doesn't end in 0 or 5, not divisible by 5 | PRIME |

93 | 93 : odd, not divisible by 2 | 93 : 9+3=12 , divisible by 3 | COMPOSITE | COMPOSITE |

7 | 7 : odd, not divisible by 2 | 7 : not divisible by 3 | 7 : not divisible by 5 | PRIME |

11 | 11 : odd, not divisible by 2 | 11 : 1+1= 2 : not divisible by 3 | 11 : not divisible by 5 | PRIME |

1 | NEITHER prime or composite | NEITHER | NEITHER | NEITHER |

Created by:
PRO Teacher
lit123