Lottery Systems — The Basics
“Calculating Traditional Root Sums”
The instructions are noted below.
In the simplest terms, finding the root sum of a combination involves reducing its sum down to a single digit.
For example, the root sum of “59872” is 4.
You get this by adding all digits of the number / combination together:
5+9+8+7+2=31 and 3+1=4.
You will note that the first sum of the digits added together was 31, but because this is not a single digit, we had to take the additional step by adding those two digits together to get down to a single digit–and to what is called the “root” sum.
Finding Traditional Root Sums
Let us find the sum of these five (5) Pick 3 combinations, and then take it to its single-digit root sum:
429=4+2+9=15 and 1+5=6. 6 is the root sum of 429
837=8+3+7=18, and 1+8=9. 9 is the root sum of 837
063=0+6+3=9. 9 is the root sum of 063 (since the first sum is already a single digit, we stop there).
482=4+8+2=14 and 1+4=5. 5 is the root sum of 482
236=2+3+6=2. 2 is the root sum of 236
A simple way to finding root sums is to isolate/forget about any digits that add up to nine (9). For example, in the 236 example, we can easily see that 3+6 equals 9, so we know the root sum is 2. Same deal with the 429: when we discard the 9, we know the root sum is 6. This holds true except in an example like 063 where you would not forget about the nine because that is the total sum.
Last example: 59872–in this combination, when we take out the 9 and the 72 (because it equals 9), we can easily add up the 5 plus 8 to get our root sum of 4 (5+8=13 and 1+3=4)