* Different Adaptations: There are countless film adaptations of her work, but some stories have been made into movies multiple times (with varying degrees of fidelity to the original).
* Short Stories: Christie wrote numerous short stories, many of which have been adapted into film, sometimes as part of anthologies.
* TV Movies: Many of Christie's novels and stories have been adapted for television, which adds to the count.
To give you a general idea:
* Over 40 of Christie's novels have been adapted for the big screen.
* Dozens more have been adapted for television.
* Many short stories have also been adapted for film and television.
If you're interested in a specific novel or story, you can easily find information about its film adaptations online.