KeithSchwarz.comBack | Forward

The Magic Boxes

This is a classic mathematical magic trick that requires complex knowledge to understand but only simple math to operate.

Pick a number between 1-50, inclusive, and check all the boxes that contain your number. When you're done, click the button.

 
Box 1 Box 2
1 3 5 7 9
11 13 15 17 19
21 23 25 27 29
31 33 35 37 39
41 43 45 47 49
2 3 6 7 10
11 14 15 18 19
22 23 26 27 30
31 34 35 38 39
42 43 46 47 50
Box 3 Box 4
4 5 6 7 12
13 14 15 20 21
22 23 28 29 30
31 36 37 38 39
44 45 46 47  
8 9 10 11 12
13 14 15 24 25
26 27 28 29 30
31 40 41 42 43
44 45 46 47  
Box 5 Box 6
16 17 18 19 20
21 22 23 24 25
26 27 28 29 30
31 48 49 50  
         
32 33 34 35 36
37 38 39 40 41
42 43 44 45 46
47 48 49 50  
         
 

 

 


How does it work?