You need as many qualifying numbers as you can put in your resume. Because accomplishments matter a lot, but so does the order of magnitude of the budget, P&L, number of database records or accounts with which you've been working..
Rough numbers are fine and so are estimates. Hiring managers want an idea of whether you managed 10 or 100, whether your P&L was $10,000 or $10 million.
Here are some examples of where you can insert numbers to make your resume more specific and, as a result, more powerful.
· What percent did revenue rise as a result of the campaign you managed?
· How much did turnover reduce after the training you designed? How many people did you manage and what was the P&L?
· How many students turned out at the blood drive you managed senior year?
· What was the budget of the on campus organization you ran?
Go through your resume. Twice. Ask if there is a number associated with everything on it. There will not be for everything. But every number will help clarify the picture, and clarity works in your favor - 70% of the time.