454 rounded to the nearest ten is 450. Since 5 is in the tens place, you round 54 down to 50 because the 4 is not 5 or greater than 5.
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450
500
Round 42,199,279 to the nearest 10 million.
To round 12 to the nearest 10, you look at the digit in the tens place, which is 1. Since 1 is less than 5, you round down. Therefore, rounding 12 to the nearest 10 gives you 10.
It would stay the same