Q: How is the number 40,155,798 written in Scientific Notation?
A: 4.0155798 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 40,155,798 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: | 4 | . | 0 | 1 | 5 | 5 | 7 | 9 | 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 = 4.0155798
b = 7
Now the whole thing:
4.0155798 x 107
Check your work:
107 = 10,000,000 x 4.0155798 = 40,155,798
| 40,155,796 | 40,155,797 | 40,155,799 | 40,155,800 |
| 4.0155796 x 107 | 4.0155797 x 107 | 4.0155799 x 107 | 4.01558 x 107 |