I'm writing my Thesis and I need a bit of assitance with this one. If I have decided to write all numbers less than 10 as text, should I apply this to these cases as well?

1. "On the other hand, subset number 9 was ..."

2. "...increase the probability of belonging to group 1..."

3. "...uses a total of 59 variables of which 7 are... "

4. "X was able to reduce the number of variables from 99 to 7 without... "

5. "A computer with 4 Gb of available memory"

6. "Begin a new round from step 3"

Thanks!