Because 450 is nearer to zero than it is to 1,000.
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This depends what you are rounding 450 to. If its to the nearest hundred it's 500. If it is to the nearest whole number or tens place then it is 450.
0 (zero) is 409 rounded to 1000's.
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921 rounded to the nearest ten thousand is 0. Rounded to the nearest thousand is 1000.
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176 rounded to the nearest 1000 is 0
450.0
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345 rounds to zero.
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