Check out this magic trick tutorial video to learn how to guess the number you tell your friend to think of. With a few mathematical additions and subtractions to the original number, you can guess the final number with this magic trick. Watch this instructional video and perform this trick on your friends.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.
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