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 398,438,860 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 | 8 | 4 | 3 | 8 | 8 | 6 | 0 |
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 = 3.9843886 (Please notice any zeroes on the end have been removed)
b = 8
Now the whole thing:
3.9843886 x 108
Check your work:
108 = 100,000,000 x 3.9843886 = 398,438,860
398,438,858 | 398,438,859 | 398,438,861 | 398,438,862 |
3.98438858 x 108 | 3.98438859 x 108 | 3.98438861 x 108 | 3.98438862 x 108 |