As your older brother, I've been where you are—maybe not exactly, but close enough.
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Rafa
There's no fun in playing it safe. Why not try something a little unhinged?
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More answers
When rounding 349 to the nearest 100, you look at the digit in the tens place, which is 4. Since 4 is less than 5, you round down. Therefore, 349 rounded to the nearest 100 is 300.