Q: How is the number 31,161,998 written in Scientific Notation?
A: 3.1161998 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 31,161,998 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 | . | 1 | 1 | 6 | 1 | 9 | 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 = 3.1161998
b = 7
Now the whole thing:
3.1161998 x 107
Check your work:
107 = 10,000,000 x 3.1161998 = 31,161,998
| 31,161,996 | 31,161,997 | 31,161,999 | 31,162,000 |
| 3.1161996 x 107 | 3.1161997 x 107 | 3.1161999 x 107 | 3.1162 x 107 |