Holly Holly Holly Holly Holly Holly Holly

Christmas Ornaments

Arrange the ornaments in the box so that no more than
three are in any line horizontally, vertically or diagonally.

Teacher: There are also self-checking versions of this activity for different sized grids:
2 by 2 3 by 3 4 by 4 5 by 5

A Christmas Mathematics Lesson Starter Of The Day


Topics: Starter | Puzzles | Xmas

You can find many more ChristMaths activities at:

Transum.org/ChristMaths/

ChristMaths

  • Rachael, Kirsty and Ewan, Leswalt Primary
  •  
  • We really enjoyed doing this.
  • Katie Lumsdaine F2 High School Of Dundee, High School Of Dundee
  •  
  • It was challenging but fun and we could use this method to decorate our Christmas tree! :).
  • Transum,
  •  
  • After solving the problem for the 4 by 4 grid (not forgetting to check the diagonals) investigate how many different solutions there are. Extend to a 5 by 5 grid and then consider how many ornaments could be arranged on an n by n grid if each column, row and diagonal must contain one empty space.
  • Mr Shepherd, St Lawrence Academy, Scunthorpe
  •  
  • 7set4 and 9set4 really enjoyed this, given a minute each and a default fail as soon as a line was completed. We managed to get 14 pupils involved in a 10 minute slot. Exetending to how many possible solutions was beyond them though.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.
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Previous Day | This starter is for 11 December | Next Day

 

Answers

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There is a printable worksheet to go with this activity.

Worksheet

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Laptops In Lessons

Teacher, do your students have access to computers?
Do they have iPads or Laptops in Lessons?

Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

Here a concise URL for a version of this page without the comments.

Transum.org/go/?Start=December11

Here is the URL which will take them to the student version of this activity.

Transum.org/go/?to=xmas

Student Activity

OR

Investigate other sized ornament boxes using a spreadsheet.

Use "1" to represent an ornament in the box.

Set up row and column totals to check whether your solution is correct


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