Q: How is the number 7,172,640 written in Scientific Notation?

Why is 7,172,640 written as 7.17264 x 10⁶ in scientific notation?

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 10^b

Follow the steps below to see how 7,172,640 is written in scientific notation.

Step 1

To find a, take the number and move a decimal place to the right one position.

• Original Number: 7,172,640
• New Number: 7.172640

Step 2

Now, to find b, count how many places to the right of the decimal.

New Number:	7	.	1	7	2	6	4	0
Decimal Count:			1	2	3	4	5	6

There are 6 places to the right of the decimal place.

Step 3

Building upon what we know above, we can now reconstruct the number into scientific notation.

Remember, the notation is: a x 10^b

a = 7.17264 (Please notice any zeroes on the end have been removed)

b = 6

Now the whole thing:

7.17264 x 10⁶

Step 4

Check your work:

10⁶ = 1,000,000 x 7.17264 = 7,172,640

More Scientific Notation Examples