Divide all values of a column

How can I divide all values of a given column by a number? Lets say I have a dataframe that contains 10 columns and I need to divide by 1000 one of them. I've tried a couple of solutions bot none of them works well.
Thanks!

Have you considered dividing by 1000 via dplyr::mutate()?

library(dplyr)

frm <- data.frame(cats = c(1000, 2000, 3000))

print(frm)
  cats
1 1000
2 2000
3 3000

frm <- frm %>% 
   mutate(dogs = cats / 1000)

print(frm)
  cats dogs
1 1000    1
2 2000    2
3 3000    3
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