The numbers in the circles add up to the numbers

in the
rectangles between them.

Type in the missing numbers according to the rule.

You can earn a Transum Trophy for correctly completing eight arithmagons at any one level.

You are currently working on Level 1: The basic arithmagon, three single digit numbers given in circles. The numbers in the rectangles are the sum of the two adjacent circle numbers.

You have earned a trophy for this level but there are more levels for you to try!

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◯ ◯ ◯ | ◯ ◯ ▭ | ◯ ▭ ▭ | ▭ ▭ ▭ | |

1 | Level 1 | Level 2 | Level 3 | Level 4 |

5 | Level 5 | Level 6 | Level 7 | Level 8 |

9 | Level 9 | Level 10 | Level 11 | Level 12 |

◯ ◯ ◯ | ◯ ◯ ▭ | ◯ ▭ ▭ | ▭ ▭ ▭ | |

13 | Level 13 | Level 14 | Level 15 | Level 16 |

17 | Level 17 | Level 18 | Level 19 | Level 20 |

21 | Level 21 | Level 22 | Level 23 | Level 24 |

◯ ◯ ◯ | ◯ ◯ ▭ | ◯ ▭ ▭ | ▭ ▭ ▭ | |

25 | Level 25 | Level 26 | Level 27 | Level 28 |

29 | Level 29 | Level 30 | Level 31 | Level 32 |

33 | Level 33 | Level 34 | Level 35 | Level 36 |

◯ ◯ ◯ | ◯ ◯ ▭ | ◯ ▭ ▭ | ▭ ▭ ▭ | |

37 | Level 37 | Level 38 | Level 39 | Level 40 |

41 | Level 41 | Level 42 | Level 43 | Level 44 |

45 | Level 45 | Level 46 | Level 47 | Level 48 |

The first Arithmagon you will see is a triangle with three circles at its vertices and rectangles on its sides. The idea is to add up the two numbers in circles at either end of a side of a triangle and type the answer into the rectangle on the middle of that side.

Click the check button when you have filled in all three rectangles. If you are correct you will see one slice of a pie chart showing your progress so far. Complete eight Arithmagons to earn a Transum Trophy.

This first level you should find very easy. It gets more difficult when you are not given the three circle numbers but are given the rectangle numbers instead. That’s when you need to come up with a strategy!

You are currently working on Level 1: The basic arithmagon, three single digit numbers given in circles. The numbers in the rectangles are the sum of the two adjacent circle numbers.

Close