2439.857: The last digit is ten-thousandths, so that it must be dropped. Since it is larger than 5, dropping it requires increasing the preceding digit by 1.
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To the nearest thousandth, 12.721 To the nearest thousand, zero.
It is zero but rounded to the nearest thousandth it is 6.586
1.99487 is 1.995 to the nearest thousandth ( 487 rounds to 500 )
To the nearest ten thousandth, 0.0011
Assume the question should read, "Round 7.77777 to the nearest thousandth ?"The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1".The first figure to be discarded is the fourth 7 after the decimal point. As this is 5 or more then the previous figure (the third 7 after the decimal point) is increased by 1 (to 8).7.77777 rounded to the nearest thousandth is 7.778.