480
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The number must be in the range of 781 to 799. To have 8 more tens than ones, the number must have a tens digit of 8 and a ones digit of 0. Therefore, the number is 780.
780 is.
781
778 rounding to the nearest 10 is 780. The digit to the right of the tens is the ones. When rounding anything less than five you round down. When rounding anything five or more you round up. The ones digit is 8, which is more than 5, so you round up, making the answer 780.
798