Question

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

6 – (–9)
A. 15;

B. 13;
C. –3;
D. 15;

Answer 1

6 – (–9)
= 6+9
=15

answer is A. 15; and D. 15; (because both have the same answer = 15)