Q: How is the number 521,221,451 written in Scientific Notation?
A: 5.21221451 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 521,221,451 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: | 5 | . | 2 | 1 | 2 | 2 | 1 | 4 | 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 = 5.21221451
b = 8
Now the whole thing:
5.21221451 x 108
Check your work:
108 = 100,000,000 x 5.21221451 = 521,221,451
| 521,221,449 | 521,221,450 | 521,221,452 | 521,221,453 |
| 5.21221449 x 108 | 5.2122145 x 108 | 5.21221452 x 108 | 5.21221453 x 108 |