79
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When rounding a decimal number to the nearest whole number, you look at the digit immediately to the right of the decimal point. In this case, the digit is 5. Since 5 is equal to or greater than 5, you round up the whole number. Therefore, 78.5 rounded to the nearest whole number is 79.
1000
When rounding 785 to the nearest tens place (which is 790), we look at the digit in the ones place, which is 5. Since 5 is equal to or greater than 5, we round up the digit in the tens place to 9. Therefore, 785 rounded to the nearest tens place is 790.
486.7
795
78.50