Use the text on path feature:
1. Create a reference circle to show the outer edge of the numbers alignment.
2. Draw a vector line that is a diameter of the circle.
3. Duplicate and rotate that diameter line as many times as you need numbers.
4. Enter the numbers as text.
5. Select one number and one diameter line and use Objects...Fit Text to Path. This will align the number so it's perpendicular to the diameter:

- text sample.png (8.89 KiB) Viewed 5935 times
6. Select the number and change its text offset to center it vertically on the diameter line.
7. Move the number to align its right edge with the reference circle.

- text sample 02.png (8.75 KiB) Viewed 5935 times
8. Repeat steps #5 - #7 for the other numbers and diameter lines.
9. Set the line width of those diameter lines to 0.00 so they will not appear.
Edit:
As a matter of fact, if you do just one number and diameter line, setting the diameter line to a width of 0.00, you can simply duplicate and rotate the combo and change the number text.