Q: How is the number 389,689,680 written in Scientific Notation?
A: 3.8968968 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 389,689,680 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 | . | 8 | 9 | 6 | 8 | 9 | 6 | 8 | 0 |
| 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 = 3.8968968 (Please notice any zeroes on the end have been removed)
b = 8
Now the whole thing:
3.8968968 x 108
Check your work:
108 = 100,000,000 x 3.8968968 = 389,689,680
| 389,689,678 | 389,689,679 | 389,689,681 | 389,689,682 |
| 3.89689678 x 108 | 3.89689679 x 108 | 3.89689681 x 108 | 3.89689682 x 108 |