"Responsible for customer support" tells the reader what your job was. "Answered 60 tickets a day at 95% satisfaction" tells them how good you were at it. Numbers do that in a few characters.
Turn a duty into a result
Ask three questions of each line:
- How much? Volume, size, money, people.
- How well? Speed, accuracy, quality, satisfaction.
- What changed? Before and after, because of you.
"Managed the newsletter" becomes "Grew the newsletter from 4,000 to 15,000 subscribers in a year, with 38% opens."
Where to find numbers
- Reports, dashboards and performance reviews.
- Targets you were given, and how you did against them.
- Counts you can make yourself: projects shipped, people trained, events run, customers served a day.
- Time saved: a process that took four hours and now takes one.
Estimates are fine, if they are honest
"About 40 customers a day" is a fair estimate if it's true on a normal day. Don't round up into a claim you couldn't explain in an interview, and don't share figures your employer treats as confidential: use percentages instead.
Not everything needs a number
Two or three strong figures per job are enough. A line like "Trusted to open and close the store" says something numbers can't.
See them used in the resume examples, then make your resume.