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 720,365,100 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 | . | 2 | 0 | 3 | 6 | 5 | 1 | 0 | 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 = 7.203651 (Please notice any zeroes on the end have been removed)
b = 8
Now the whole thing:
7.203651 x 108
Check your work:
108 = 100,000,000 x 7.203651 = 720,365,100
720,365,098 | 720,365,099 | 720,365,101 | 720,365,102 |
7.20365098 x 108 | 7.20365099 x 108 | 7.20365101 x 108 | 7.20365102 x 108 |