Numbers are written by arranging digits in a row and each place in the row has a different value. This value depends on the base of the number system. The most common base nowadays is 10:

10x10x10x10	10x10x10	10x10	10	1
Ten thousands	Thousands	Hundreds	Tens	Units/Ones

We often use these short forms for the columns:

TTh

To count in different bases, we just group numbers in a different way. For example, for base 2:

2x2x2x2x2x2	2x2x2x2x2	2x2x2x2	2x2x2	2x2	2	1
Sixty fours	Thirty twos	Sixteens	Eights	Fours	Twos	Units/Ones

Zios count in base 3 so their numbers are grouped like this (we shall only look at the first three columns):

3x3	3	1
Nines	Threes	Units/Ones

Let's work out what a Zio's 111 is in human numbers (base 10):

Nines	Threes	Units/Ones
1	1	1

So, 111 = (1 x 9) + (1 x 3) + 1 = 13.

Zepts count in base 7 so their numbers are grouped like this:

7x7	7	1
Forty nines	Sevens	Units/Ones

Let's see what a Zept's 111 is in base 10:

Forty nines	Sevens	Units/Ones
1	1	1

So, 111 = (1 x 49) + (1 x 7) + 1 = 57.

To find out which way each type of creature is facing, calculate each number in human counting (base 10).

Remember that the creatures must be seeing numbers which could be a combination of Zios' and Zepts' legs.