Words for inexact amounts: about, roughly, approximately, around
About/Roughly/Approximately/Around + number/quantity
Not quite/exactly + number
About how many people came?
💡 Approximately = most formal; about/around = neutral; roughly = slightly informal.
✓The journey takes about two hours.
✗The journey takes about two hour.
Normal noun rules apply after approximate words.
✓Approximately 1,000 people were affected.
✗Approximate 1,000 people were affected.
Use adverb 'approximately', not adjective 'approximate'.
✓It happened around 3 o'clock.
✗It happened around at 3 o'clock.
Don't use 'at' after 'around' for time.