Introduction to Negative Numbers

A _________ is any number that can be written as a fraction.

Any whole number is also called an ________________

A ___________ will always be a ____________

• integer, rational number

• rational number, integer

• positive, negative

• negative, positive

Where might we see negative numbers in the real world?

A bank uses positive numbers to represent deposits and negative numbers to represent withdrawals.

How would a bank represent a deposit of 126.40?

• -126.40

• 126.40

Divers use positive numbers to represent the height of the diving board and negative numbers to represent the depth of a dive.

How would divers represent a dive with a depth of 4 3/4?

• 4 3/4

• -4 3/4

Geographers use negative numbers to represent points below sea level and positive numbers to represent points above sea level.

How would geographers represent a point 7 1/4?

• 7 1/4

• -7 1/4

Credit card companies use negative balances to represent when the credit card company owes the customer money and positive balances to represent when the customer owes the credit card company money.

Tori has a balance of 0 dollars with her credit card company.

What does a balance of 0 dollars represent?

• The credit card company owes Tori money.

• Tori owes the credit card company money.

• Neither Tori or the credit card company owes either money.

Looking at the number line what is a reasonable value for point B?

• 2.1

• 5.4

• -2.1

• -5.4

What value is the blue question mark?