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Magic with the calendar


Have a person mark any given calendar month in a 3-by-3 “square” containing 9 days. See an example of a calendar choice below for August 2005.

August 2005
SunMonTueWedThuFriSat
123456
78910111213
14151617181920
21222324252627
28293031

Then ask her to tell you the smallest date on the square, and say that with just that date you will find out the sum of all chosen dates. To do so, you must add the smallest date (in this case 10) with 8 and multiply the result by 9.

That is, (10 + 8) x 9 = 18 x 9 = 162

(i.e. 10 + 11 + 12 + 17 + 18 + 19 + 24 + 25 + 26 = 162).