## Digits Sum Root

This filter is similar to Sum Root filter - it accepts tickets with selected *sum root* values calculated from first and/or last digits. Sum root is a
single digit number ranging from 1 to 9. It is calculated from
arithmetic sum of ticket's first or last digits of main numbers by repeatedly summing the
digits of the sum value until only a single digit number is left.

**Note:** When playing powerball-like lotteries which draw one or more numbers
from a separate pool then the powerball number(s) is not included in
ticket's sum value.

### Example

When filtering with settings *Sum root of last digit is: 3, 5* then:

- 01-02-03-04-05-06 - filter accepts this ticket because the sum of its last digits is 21 and the root of that sum is 3.
- 10-23-24-32-35-49 - filter accepts this ticket because the sum of its last digits is 0+3+4+2+5+9=23 and the root of that sum is 5.
- 01-02-03-04-05-07- filter rejects this ticket because the sum of its last digits is 22 with the root value of 4 which is not allowed in filter's condition.

**Note:** When filter with settings *Sum root of first and last digits is...* then the filter behaves the same way as Sum Root filter.

See also Digits Sum Root statistics.