The least common multiple of them both (10 and 14) would be 70!
Now to break it down a little for the people in the back -
10's least common multiples go a little like this.. 60, 70, 80- etc.
While 14's least common multiples are 56, 70, 84, etc.
Which number is in common ? 70! (:
I hope all is well, and you pass! Good luck, rockstar!