It is 420.
Although many schools teach you to round 5 up, always rounding up from 5 is inappropriate because it introduces an upward bias. The IEEE (Institute of Electronic and Electrical Engineers) standard 754 is to round 5 up or down so that the new last digit is even. See link for more: //en.wikipedia.org/wiki/Rounding#Round_half_to_even
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Rounded to the nearest ten thousand, 425 is approximately equal to 0.
1.6569 is 0 (zero) rounded off the the nearest ten.
1 rounded to the nearest ten is zero.
900
6700