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# 2.10 Programming Page 10

**Important Facts About Variables: **

##### 1. Variable names are case sensitive. X is not the same as x.

##### 2. There are shortcuts for operations with variables.

##### += will add one to the variable

##### e.g

##### x = 0

##### x += 1

##### x -= 1 will subtract one from the variable

##### You can add any amount by adding an integer +=3

##### e.g. x+=3 adds 3 to x every time the command executes.

##### 3. There is a process called "TypeCasting". If there are two different variable types used in an equation Python will force them all to be floating point.

##### e.g. If x is an integer and y is a float z= x * y will result in z being a float answer.

##### 4. Large numbers are written in Exponential Form.

##### e.g. 20.12 raised to the power of 8 is written as 20.12E8

*Practice Activity:*

**a = 10**

**a += 2**

**print(a)**