Had such a hard time with this one at first. Could not for the life if me figure out why it wasn’t scaling properly. Then I realized the cube was already 2x2x2. Instead of just scaling by 10, I’d scale by 20 and it would never look like the finished project. Finally figured it out though!
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Yes, the cube is 1x1x1, but it’s the vector from the center. Whereby the cube central (origin) point lies in the middle on world grid 0,0,0. You’re not the only one with this eureka moment. 
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Thank you, have fun and stay healthy.
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Very glad to know I’m not alone! 