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To round 779.7 to the nearest whole number, we look at the digit in the tenths place, which is 7. Since 7 is 5 or greater, we round up the whole number to 780. This is because when rounding decimals, if the digit to the right of the place we are rounding to is 5 or more, we increase the digit in that place by 1.
To round any number, look at the digit to the right of the place you are rounding to. If the digit is 5 or more, change the digit in the place you are rounding to to the next higher digit. If the digit to the right of the place you are rounding to is less than 5, leave the digit in the place you are rounding to as it is. Change all digits to the right of the place you rounded to to zeros. 3.22 rounded to the nearest tenth is 3.2
To round 10.99557429 to one decimal place, you look at the digit in the tenths place, which is the second digit after the decimal point. In this case, the digit in the tenths place is 9. Since 9 is greater than or equal to 5, you round up the digit in the tenths place to the next higher number. Therefore, rounding 10.99557429 to one decimal place gives you 11.0.