Find the sum of the digits in the number 1643 x 312534                                                                                                                                                                                                                                                                                                      

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Form is valid through January 2016


Dear visitors,

many thanks to all of you for your effort and your solutions.

The first to send the correct solution were Alexander Pappas, King James, David Sullivan and Christian Bedat.

Again, many thanks

and hope to hear from you soon.

Serge Hazanov


Here is the solution of the January 2016 problem:


2172 x 5170 =4x10170 = 40000000….00000.

The sum of the digits is a 4.