Addition grids magic mathematical matrix tables
Age Group
10 11 12 13 14
Expected time
1 period
The timely prediction.PDF
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The timely prediction

What’s the mystery? A random number is freely generated by the learners, only for the teacher to magically match it to a prediction about the current date or location.
Domain(s) Mathematics
Subdomain keywords Addition grids, tables, magic mathematical row column, matrix.
Age group 8 to 14 years old (with different levels of differentiation).
Expected time for the mystery Approximate time for teacher preparation: 30 min.Approximate time for the mystery: 40 min.
Safety/supervision No safety precautions required.Disclaimer: the authors of this teaching material will not be held responsible for any injury or damage to persons or properties that might occur in its use.
Preparation and list of materials Paper, pens, grids of numbers prepared by teacher similar to those shown in this document, calculators.
Learning objectives Student will practise addition and subtraction skills. They will also explore number patterns and data structures such as matrices.
Resources The necessary tables are at the end of attached PDF. However, it would be a good idea to make your own with another number that is more relevant.Also see:

  • In Magic of Computer Science book 1 (p. 53), the square of fortune gives a different presentation and resources on the computer science applications of the mathematical principle at the basis of this trick. For instance, they discuss its application to medical imaging.

The concept of a forcing matrix, more methods, and a spreadsheet for grid generation is given at: