450 to the nearest 1000 is 0. When rounding to the nearest 1000, we look at the hundreds place. Since 450 is less than 500, it rounds down to 0 when considering the nearest 1000.
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Because 450 is nearer to zero than it is to 1,000.
You do nothing. 450 is already rounded to the nearest ten.
450
550
1000-450 equal to = 550