15
987654321 is the highest nine-digit number with no repeated digits.
nine - look at the last number of any number and start counting as ones. Then move left and start counting as tens, then hundreds, thousands, ten thousands, hundred thousands, millions, ten millions, hundred millions, billions, ten billions, hundred billions, trillions, ten trillions, and finally hundred trillions. So 1,000,000,000 is one billion.
The fifteenth place to the left of the decimal point is the hundred trillions' place.
It is 889,877,761,663,555
3400 We round the number up to the nearest hundred if the last two digits in the number are 50 or above. We round the number down to the nearest hundred if the last two digits in the number are 49 or below. If the last two digits are 00, then we do not have to do any rounding, because it is already to the hundred.
The estimated trillion digits of pi are 27 trillion digits. An exact equal value would require an infinite number of digits and cannot be proved to any exact trillions.
899
99
999
No as 100000000 has more digits than 2500000 Remember; The highest value number has the highest amount of digits
9876543210
987,654 (nine hundred eighty-seven thousand, six hundred fifty-four).