Answer:
Your answer is B. :)
Explanation:
22.3 - 6.6 = 15.7
Work check.
22.3
6.6
---------
15.7
(3 gets changed to 13, so it's 13-6 which equals 7. The 2 was changed to 1 to make the 13. So, it gets turned 11-6 which equals 5. The 2 was changed to 1 to make the 11, so you bring the 1 down. Then, just bring the decimal point down and you're done.)