Q: How is the number 398,438,864 written in Scientific Notation?
A: 3.98438864 x 108
The purpose of scientific notation is for scientists to write very large, or very small, numbers with ease.
Calculating scientific notation for a positive integer is simple, as it always follows this notation:
a x 10b
Follow the steps below to see how 398,438,864 is written in scientific notation.
To find a, take the number and move a decimal place to the right one position.
Now, to find b, count how many places to the right of the decimal.
| New Number: | 3 | . | 9 | 8 | 4 | 3 | 8 | 8 | 6 | 4 |
| Decimal Count: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
There are 8 places to the right of the decimal place.
Building upon what we know above, we can now reconstruct the number into scientific notation.
Remember, the notation is: a x 10b
a = 3.98438864
b = 8
Now the whole thing:
3.98438864 x 108
Check your work:
108 = 100,000,000 x 3.98438864 = 398,438,864
| 398,438,862 | 398,438,863 | 398,438,865 | 398,438,866 |
| 3.98438862 x 108 | 3.98438863 x 108 | 3.98438865 x 108 | 3.98438866 x 108 |