Hello!
This is simple math, all you will have to do is set it up like this:
1 1
677 (7 plus 7 is 14, carry the 1)
+67 (7+6 is 13 then add the 1 which is 14, carry the 1)
------ (6+1 is 7)
744
So, when you follow the steps above that gives you your answer which is, (744.)
I hope this helped!
I am, yours most sincerely,
SuperHelperThingy