How easy would be to see the Moon from Mars?
We have pictures of this, thanks to Curiousity!


(Source)


  “A human observer with normal vision, if standing on Mars, could easily see Earth and the moon as two distinct, bright “evening stars,” said NASA in a statement issued today.


So yes, you can see our moon from Mars.

The apparent brightness of our moon from Mars is +0.9. The apparent brightness of Jupiter's 4 biggest moons is between 4.6 and 5.6 under ideal conditions.  However, while our moon can be seen visually separate from Earth from Mars, Jupiter's moons can't be distinguished from Jupiter itself with an unaided eye.