Well, honey, that's a big number you got there! You read it as "one quadrillion nine hundred trillion." Hope that clears things up for you!
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The number 1,900,000,000,000,000 can be said as "one quadrillion nine hundred trillion." In this number, each group of three digits is separated by a comma to denote its place value within the number. The term "quadrillion" represents the fourth power of ten, indicating the number of groups of three zeros in the number.
The number 4,000,000,000 is read four billion.
They're simply used for clarity - to make the number easier to read.
9116
To write 0.81 in words, you would say "zero point eight one." The number before the decimal point is read as a whole number, followed by "point," and then the numbers after the decimal point are read individually. In this case, "8" is read as "eight" and "1" is read as "one."