In most areas of iOS’ Photos app, you can only delete photos one at a time. What a pain. However, if you go to the Moments section, you can actually delete photos in batches.
Before you delete anything, backup the photos you want just in case. Then, go into the Photos app, switch to the Moments section, and select all the photos you want to delete by ticking them. Then click the trash icon and delete the photos.
How to quickly delete photos and videos to free up storage on your iPhone or iPad [iMore]
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