Q: How is the number 221,525,551 written in Scientific Notation?
A: 2.21525551 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 221,525,551 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: | 2 | . | 2 | 1 | 5 | 2 | 5 | 5 | 5 | 1 |
| 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 = 2.21525551
b = 8
Now the whole thing:
2.21525551 x 108
Check your work:
108 = 100,000,000 x 2.21525551 = 221,525,551
| 221,525,549 | 221,525,550 | 221,525,552 | 221,525,553 |
| 2.21525549 x 108 | 2.2152555 x 108 | 2.21525552 x 108 | 2.21525553 x 108 |