This is part of common core math
Making Tens (and Hundreds): Composing and decomposing: Students learn to break down numbers to make friendly numbers like 10 or 100, which are easier to add. Example: To add 8 + 5, they might see that 8 needs 2 to make 10. They could take 2 from the 5, leaving 3. Then, they add 8 + 2 = 10, and 10 + 3 = 13.
They are teaching new students this
You didn’t read the article.
Trump is saying if he takes away Elon’s subsidies, Elon would be forced to pack up and go home.
Not that he would physically deport him.
It’s a misleading title