Q: How is the number 21,515,607 written in Scientific Notation?

 A: 2.1515607 x 107

Why is 21,515,607 written as 2.1515607 x 107 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 10b

Follow the steps below to see how 21,515,607 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: 21,515,607
  • New Number: 2.1515607

Step 2

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

New Number: 2.1515607
Decimal Count: 1234567

There are 7 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 10b

a = 2.1515607

b = 7

Now the whole thing:

2.1515607 x 107

Step 4

Check your work:

107 = 10,000,000 x 2.1515607 = 21,515,607


More Scientific Notation Examples

21,515,60521,515,60621,515,60821,515,609
2.1515605 x 1072.1515606 x 1072.1515608 x 1072.1515609 x 107

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