Use algebra tiles to find the difference. Let one white tile equal +1 and one black tile equal –1. 6 – (–9)

Question

 multiple choice 

Answer 1

You will need 6 white tiles to equal 6

You will need 9 black tiles to equal -9  

Since you are subtracting the (-9) from 6 you need to replace the 9 black tiles with 9 white tiles and change the subtraction to addition 

This will leave you with 15 white tiles which is equal to +15 which is the solution