How to use "one and ones"

• Out of all the regions, the one with consistent growth is North America.

• Look at these product categories—the ones with high margins are ASR connectors and SIM splices.

• There are several figures to consider, but I recommend ones that show year-over-year sales growth.

• Workshops can be effective, but if there is one about forecasting, it will interest me the most.

Examples

• "One" replaces a singular countable noun.

• "Ones" replaces a plural countable noun.

​Structure

“There are always two choices.
Two paths to take.
One is easy.
And its only reward is that it's easy.”

— Unknown