27+48 =25+2+48 =25+50 =75pic.twitter.com/WxgzrxbFgQ
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7+8 > 10, so you know there's a carry. 8 needs 2 to "complete" to 10, to get the carry. 8 borrows 2 from the 7. Now the 8 is "completed" and you're left with 5. My best try to explain it.
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