PEMDAS

Add if possible. 3xy + -7xy

• 4xy

• -4xy

• 10xy

• -10xy

Add if possible. -5x + -9x

• -4x

• 4x

• 14x

• -14x

Add if possible. $3x^2+2x$  

• 5x

•  $5x^2$  

•  $5x^3$  

• NP

Complete the statement. The only things you can every add are the _________________, and when you add the ___________________ you get the ___________________.

• numbers

• same things

• money

• NP

-5y + 4x + 3y + 9x = ?

• NP

• -2y + 13x

• 8y + 13x

• 2y + 13x

 $5ab^2+-3x^3+-8ab^2+-x^3$  

• NP

•  $-3ab^2-3x^3$  

•  $-3ab^2-4x^3$  

•  $13ab^2+4x^3$  

 $x^3+x^3+-y^3+-y^3$  

•  $2x^6+-2x^6$  

•  $xy^{12}$  

•  $x^6+-y^6$  

•  $2x^3+-2y^3$  

 $2x\ +\ 3\ +\ -4x\ +\ -9$  

•  $-2x^2+-6$  

•  $-2x+-6$  

•  $-8x$  

•  $5x+-13x$  

 $-3xy+2x^6+-xy+x^6$  

•  $-4xy+2x^6$  

•  $-2xy+3x^6$  

•  $-4xy+3x^6$  

•  $-3xy+2x^6$  

Which two statements below make up the Main Principle of Addition?

• When you add the same things you get the same things.

• You can add anything, just go straight across.

• The only things you can ever add are the same things.

• The only things you can add are letters.