Q: How is the number 645,113,169 written in Scientific Notation?
A: 6.45113169 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 645,113,169 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: | 6 | . | 4 | 5 | 1 | 1 | 3 | 1 | 6 | 9 |
| 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 = 6.45113169
b = 8
Now the whole thing:
6.45113169 x 108
Check your work:
108 = 100,000,000 x 6.45113169 = 645,113,169
| 645,113,167 | 645,113,168 | 645,113,170 | 645,113,171 |
| 6.45113167 x 108 | 6.45113168 x 108 | 6.4511317 x 108 | 6.45113171 x 108 |