When rounding 6.789 to the nearest whole number, you look at the first decimal place after the decimal point, which is 7. Since 7 is 5 or greater, you round the whole number up. Therefore, 6.789 rounded to the nearest whole number is 7.
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6800
It is already a four-digit number.
253/100
It depends. If the numbers are only used once then it is 24. More precisely it is 4!. (4 factorial which is 4x3x2x1). The same would apply to any number of digits assuming they are used once each. If there is replacement involved (any number used any number of times like 7777 or 6688), then the answer would be 256. Or in other words, the number of possible numbers raised to the power of how many digit positions there are (44). So if the question was how many 5 digit numbers can you make from 1234567?75=16807
3 5/10 is 3.5 1 2 3 . 4 5 6789 hundreds tens ones decimal point tenths hundredths ..........