Explain the structure of your lecture at the beginning of the class period. Outlining the lecture will help students fit the various points of the lecture into a larger framework. Summarizing the important points at the end of class helps, too. Give students a way to refer back to important definitions that were introduced during the lecture by keeping them on the blackboard or distributing handouts at the beginning of class. Explain concepts in multiple ways.
Some students learn best by seeing examples.
Other students may learn best by constructing an idea piece by piece. Still others grasp things by understanding a concept as a whole, i.e. the gestalt. Also, try to use verbal, written, and graphical descriptions whenever possible. Make sure to call attention to new assignments, and give them both orally and in writing. If you have an LD student in your class who is struggling, ask what you could do to help.