Q: How is the number 90,515,138 written in Scientific Notation?
A: 9.0515138 x 107
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 90,515,138 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: | 9 | . | 0 | 5 | 1 | 5 | 1 | 3 | 8 |
| Decimal Count: | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
There are 7 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 = 9.0515138
b = 7
Now the whole thing:
9.0515138 x 107
Check your work:
107 = 10,000,000 x 9.0515138 = 90,515,138
| 90,515,136 | 90,515,137 | 90,515,139 | 90,515,140 |
| 9.0515136 x 107 | 9.0515137 x 107 | 9.0515139 x 107 | 9.051514 x 107 |