That's nine places.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the ten millions place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
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300,000,000
6523183959 rounded to the nearest 100 million would be 6,500,000,000
It is 300000000.
6,523,183,959 rounded to the nearest hundred millions is 6,500,000,000
1.181351 rounded to the nearest tenth-million, or the nearest ten thousand, or thenearest thousand, or the nearest hundred, or or the nearest ten, is zero in each case.