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::--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==-=:: :: ..ooO Social Insurance Number Checksums by Moe1 Ooo.. :: ::--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==-=:: :: :: :: Social Insurance Numbers are validated by a simple checksum process. :: :: :: :: Example using a valid Social Insurance Number: :: :: :: :: 236 454 286 (Social Insurance Number) :: :: :: :: 236 454 286 \ Multiply each top number :: :: 121 212 121 / by the number below it :: :: ----------- :: :: 266 858 276 and get this. :: :: ^ :: :: ^ :: :: Notice here that 8*2=16, add the 1 and :: :: the 6 together from 16 and get 7. If you get a :: :: 2 digit number always add the digits together. :: :: :: :: 2+6+6+8+5+8+2+7+6=50 (Now Add all the digits together) :: :: ^^ :: :: ^^ :: :: If the Social Insurance Number is valid this :: :: number will be evenly divisible by 10. :: :: :: :: Since 50 is a multiple of 10 our example is a valid Social Insurance No. :: :: :: ::--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==-=::