**Express numbers in scientific notation (ACMNA210)**

**LO: To express numbers in scientific notation.**

**Know:**

- What is a coefficient
- What is an index
- How numbers are used in a base-10 model.

**Understand:**

- that scientific notation helps to simplify large numbers.

**Do:**

- I can express numbers in scientific notation.

**Essential Questions:**

- What are the index laws?

**Examples (Visual Representations)**

**Examples (Visual Representations)**

**Scientific Notation**

**Scientific Notation**

## Since all western world numbers use a base-10 model (each number has a place value of 10), large numbers can be written using scientific notation.

## This is used to help reduce mistakes in calculations. Remember if you add an extra zero or you miss a zero you could be making something 10 times bigger or smaller.

## Large numbers can be written with a positive exponent (index) and small decimal numbers can be written with a negative exponent (index).

## The exponent (index) basically corresponds with how many times you need to move the decimal to the right or left. If you need to move the decimal 5 to the right you would have a positive 5 as your index. If you have to move the decimal 4 to the left you would have a negative 4 as your index.

**Scientific Notation Videos**

**Scientific Notation Videos**

**Practice Questions**

**Practice Questions**

# My Maths 9

pg. 73 Q. 1-3, 5-6,