6.12*102 = 612
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Ten to the second power is 100. Move the decimal over two places. 110
100 nonillion.
To round 612 to the nearest ten, we look at the digit in the tens place, which is 1. Since the digit in the ones place is less than 5, we round down. Therefore, 612 rounded to the nearest ten is 610.
5,000,000
400,000