1) Which number is a common denominator for 2 1/5 and 1 5/6

Answer:
The common denominator for 2 1/5 and 1 5/6 is 11.
Step-by-step explanation:
it is 5 if you do keep change flip so you flip 1⅚ to 1 6/5 to match the denominator and solve the problem and then change the plus to a minus also keep the 2 1/5 there.