# Converting Scientific Notation to a Number(KS3, Year 7)

homesitemapcccccconverting scientific notation to a number
Scientific notation is a way of writing a number. We need to know what number the scientific notation represents. Imagine we wanted to know what number 1.23 × 105 represents.

## How to Convert Scientific Notation to a Number

Converting scientific notation to a number is easy.

## Question

What is 1.23 × 105 written in full?
In scientific notation, a number between 1 and 10 (1.23 in this example) is multiplied by a power of 10 (105 in this example).

## 1

Look at the number between 1 and 10. In our example, the number between 1 and 10 is 1.23. Find the decimal point in the number between 1 and 10. Don't forget: If the number does not have a decimal point written, it can be written at the end of the number with a 0 after it (1 = 1.0).

## 2

Find the exponent of the power of 10. In our example, the exponent of the power of 10 is 5.

## 3

Move the decimal point found in Step 1 by the number of places given by the exponent in Step 2. In our example, we will move the decimal places 5 places to the right.
• When we move the decimal point 2 places to the right, we come to the end of the last digit in the number.
• To move the full 5 places, we need to write 0s in the last 3 places.

We have taken the number written in scientific notation and written it in full:
1.23 × 105 = 123,000

## Lesson Slides

The slider below gives a real example of converting scientific notation to a number.

## What Is Scientific Notation?

Scientific notation is a way of writing a number. In scientific notation, a number is written as a number between 1 and 10 multiplied by a power of 10. The number below is written in scientific notation. It is said as "1.2 times 10 to the 3".

## What Is a Power of 10?

A power of 10 is 10 raised to a exponent. For example, 102 is a power of 10. The small 2 written beside the 10 means it is raised to an exponent of 2. This means 10 is multiplied by itself 2 times.

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