Move the decimal points to the left. The number of places to the left is the number of 0s in the denominator.
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308 rounded to the nearest tens place is 310. 308 rounded to the nearest 100s place is 300. It cannot be rounded to the nearest 1000s place.
divide both by 25 youll get 1/4th
There are 900,000,000 of them.
7 is in the 100s place, so it is 700.
The trick is just remove the number of zeros in what you are comparing to.How many 10s remove 1How many 100s remove 2How many 1000s remove 3So remove 2 zeros from 100000 and get 1000