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### Number and algebra

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### Advanced mathematics

# One of Thirty-six Poster

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Age 5 to 7

Challenge Level

- Problem
- Student Solutions

Hint | Possible numbers |

The number is odd | 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35 |

The number is a multiple of three | 3,9,15,21,27,33 |

It is smaller than 7x4 (=28) | 3,9,15,21,27 |

The tens digit is even | 21,27 |

It is the greater of the two possibilities | 27 because that is greater than 21 |

So, the answer is 27