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I am an electrical engineer who is interested in the future of power generation and science education This article is completely free but I left a paywall as a way to tip or consider sharing to your friends in science or technology
At school, we learned that if the sum of its digits (cross sum) is divisible by 3, then the number itself is divisible by 3. A new method for Pros can be executed entirely mentally, leaving everyone astonished when you use this trick. It works regardless of the number's size. Here's a small example number, and it's possible to apply it to infinitely larger numbers: 73646229385734472654132980978732023023446763338576056857.
How can you use Microsoft Windows' built-in tools to record your personal gaming experience, a video tutorial, or a presentation with your own spoken commentary as a mp4 video?
At school, we learned that if the sum of its digits (cross sum) is divisible by 3, then the number itself is divisible by 3. A new method for Pros can be executed entirely mentally, leaving everyone astonished when you use this trick. It works regardless of the number's size. Here's a small example number, and it's possible to apply it to infinitely larger numbers: 73646229385734472654132980978732023023446763338576056857.