"to check how" is a valid phrase in written English.
You can use it to introduce a question or an explanation about the way something works. For example, "I looked up the recipe online to check how it was made."
The owners assemble annually to check how things are progressing.
To check how reduction procedure can influence the results, we use observations reduced by both NEWSIPS and INES packages.
Only two American officials will be sent to check how the aid is used.
On Saturday, she glanced toward the field to check how many minutes remained before kickoff.
The association also says to check how often the information is updated and who reviews it.
Farr said he wanted to check how it worked before he sold it to other customers.
Also, be sure to check how much you can expect to claim for specific services.
They are even trying to check how I drive so that I can make deliveries.
Mr. Persichetti asks her if she would like him to check how things are going.
Back in London, I call up Ing to check how she's doing.
It's worth listening to 1916 by Motörhead just to check how wonderfully accurate that description is.
