It is 750.
800.
You just need to decide which hundred is closest. 753 is between 700 and 800. Since it's more than 750, it's closer to 800. That means the nearest hundred to 753 is 800. Final answer is 800.
It is 300 when rounded to the nearest hundred
916 rounded to the nearest hundred is 900
87.3809 is already rounded to the nearest hundred thousandths. 87.3809 rounded to the nearest thousand is 87.381.
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0
0
678 is rounded nearest hundred is 700
300
800