# Q: How is the number 123 written in Scientific Notation?

A: 1.23 x 102

## Why is 123 written as 1.23 x 102 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 123 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: 123
• New Number: 1.23

### Step 2

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

 New Number: 1 . 2 3 Decimal Count: 1 2

There are 2 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 = 1.23

b = 2

Now the whole thing:

1.23 x 102

### Step 4

102 = 100 x 1.23 = 123

### More Scientific Notation Examples

 121 122 124 125 1.21 x 102 1.22 x 102 1.24 x 102 1.25 x 102

### Explore more about the number 123:

General Questions
Factoring Questions
Calculation Questions
Miscellaneous Questions