Mathematical Games

Game 11

The Secret Code!

Imagine that You and your friend, Statistics, are playing this game together. Ask him to secretly choose an important date in his life – maybe his birthday or a favorite holiday etc.

Now he needs to perform the following steps in succession.

Sl. No. Steps to follow  
Example  
1Ask him to write the number corresponding to that
month from the month chart given above.
Let the date is 1st May. The number corresponding
to the month of May is 5. Let it be N1
May 1st


N1 = 5
2Next, multiply that number by 5.5 × 5 = 25
3Add 6 to the answer.25 + 6 = 31
4Multiply that result by 4.31 × 4 = 124
5Add 9 to the total.  124 + 9 = 133
6Multiply that result by 5.133 × 5 = 665
7Add the number of the day.
Here it is 1 (= 01) (1st May). Let it be N2
665 + 1
= 666
8Add 700 to the total.666 + 700
= 1366
9Finally, subtract the secret code 865 from the result.
This result will be like N1N2.
1366 865
= 5 01
Why does this always work?

An exception. When you subtract 865 and obtain four digits, the first two digits are the number of the month.

This is a mathematical game that you can play with your friend Statistics several times. The final answer always ends up being the concatenation of two numbers, as discussed above.


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