forward1.0 fd1.0
forward number 
The turtle moves forward by number steps, one step at a time. (If number is negative, the turtle moves backward.)
fd 10 is equivalent to repeat 10 [ jump 1 ]. fd 10.5 is equivalent to repeat 10 [ jump 1 ] jump 0.5.
If the turtle cannot move forward number steps because it is not permitted by the current topology the turtle will complete as many steps of 1 as it can, then stop.