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 21,620,870 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: | 2 | . | 1 | 6 | 2 | 0 | 8 | 7 | 0 |
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 = 2.162087 (Please notice any zeroes on the end have been removed)
b = 7
Now the whole thing:
2.162087 x 107
Check your work:
107 = 10,000,000 x 2.162087 = 21,620,870
21,620,868 | 21,620,869 | 21,620,871 | 21,620,872 |
2.1620868 x 107 | 2.1620869 x 107 | 2.1620871 x 107 | 2.1620872 x 107 |