Q: How is the number 39,685,639 written in Scientific Notation?
A: 3.9685639 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 39,685,639 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 | . | 9 | 6 | 8 | 5 | 6 | 3 | 9 |
| 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 = 3.9685639
b = 7
Now the whole thing:
3.9685639 x 107
Check your work:
107 = 10,000,000 x 3.9685639 = 39,685,639
| 39,685,637 | 39,685,638 | 39,685,640 | 39,685,641 |
| 3.9685637 x 107 | 3.9685638 x 107 | 3.968564 x 107 | 3.9685641 x 107 |