Q: How is the number 25 written in Scientific Notation?

 A: 2.5 x 101

Why is 25 written as 2.5 x 101 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 25 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: 25
  • New Number: 2.5

Step 2

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

New Number: 2.5
Decimal Count: 1

There are 1 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 = 2.5

b = 1

Now the whole thing:

2.5 x 101

Step 4

Check your work:

101 = 10 x 2.5 = 25


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