479.6+0.607+24.85=
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2,000. A front-end estimation just means to round it by the greatest value, in this case the thousands.
The name comes from the way you round. Front end rounding is keeping the first number and rounding all the numbers after that. To make the last four digits in 10124 a 0, round to the nearest ten thousand. That would be 10000. 10000 is the front end rounding 10124.
Front end : use ONLY the first few # Relative size : use the FULL # and round it
Instead of rounding each number to a given place value, we round whatever number is in the front.
Front end rounding is to the largest place. Since the number to the right of that is less than 5, we zero it and everything to the right of it out. Answer: 10,000