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When you are rounding to the nearest hundred thousand,
look at the ten thousands digit of the number.  
If the ten thousands digit is 0, 1, 2, 3, or 4, then round
down.

If the ten thousands digit is 5, 6, 7, 8, or 9, then round up.

When you round down, the Hundred Thousand digit
doesn't change, but the rest of the digits go to zero.
When you round up, then thousands digit increases by
one, and the rest of the digits go to zero.
Example: Rounding 544,352 to the Nearest hundred
Thousand
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> Rounding Numbers to the Nearest Hundred Thousand < you are here
Rounding to the Nearest Hundred Thousand < you are here
rounding to hundred thousand
Look to the right of the
hundred thousands place.

The ten thousand place
number (4) is  less than 5, so
round down to
500,000
Example-2: Rounding 574,352 to the Nearest hundred
Thousand
Look to the right of the
hundred thousands place.

The ten thousands place
number (7) is  5 or more, so
round up to
600,000