Question

Use algebra tiles to find the difference. Let one yellow tile equal +1 and one red tile equal –1.

11 – 12

A. -23
B. -1
C. 23
D. -3

Answer 1

So you have 11 yellow tiles and 12 red tiles. Each yellow tile can be canceled out by a red tile. If you take 11 of each tile, you'll end up with one red tile, or -1. B is your answer