Haven’t you ever wanted to know how to make sure a Canadian SIN number is valid? This could come in handy when doing surprise credit checks on your friends…
1. Write down your sin. For example: 044-096-857
2. Re-write your sin, but this time, double the 2nd, 4th, 6th, and 8th digits. Write the number exactly as it appears when doubled, even if it is now a 2-digit number. For example: 044-096-857 becomes 084-0912-8107.
3. Add up each individual number in the new sequence. For example: 0+8+4+0+9+1+2+8+1+0+7 = 40.
4. If the sum is a multiple of 10, then the SIN number is valid. For those mathematically-challenged readers, if the sum ends with a “0”, then the SIN is valid.
Now that you know, go impress your friends.