Q: How is the number 787,145,865 written in Scientific Notation?
A: 7.87145865 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 787,145,865 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: | 7 | . | 8 | 7 | 1 | 4 | 5 | 8 | 6 | 5 |
| 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 = 7.87145865
b = 8
Now the whole thing:
7.87145865 x 108
Check your work:
108 = 100,000,000 x 7.87145865 = 787,145,865
| 787,145,863 | 787,145,864 | 787,145,866 | 787,145,867 |
| 7.87145863 x 108 | 7.87145864 x 108 | 7.87145866 x 108 | 7.87145867 x 108 |