4000. It's kind of a trick question, rounding the last '9' up to '10' requires that the other '9's be rounded up also due to the carrying forward of a '1'.
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The answer is 4000 because 99 is closest to 000 (or 100) not 90
907.457 rounded off to nearest tens place is 910. If it were asked to round off to nearest "tenths" place, it would have been 907.5.
It is: 90
It is: 150
74 rounded off to the nearest 10 is 70.