12.7 billion rounded to the nearest 10 billion would be 13 billion.
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When rounding 127 to the nearest hundred, you look at the digit in the tens place, which is 2. Since 2 is less than 5, you round down. Therefore, 127 rounded to the nearest hundred is 100.
10 because 8 is to small to have this and 10 is the first ten there is
Rounded to the nearest ten it is 10 but rounded to the nearest tenth it is 12.6
70
420