Break one task into smaller parts to be completed at different times. Give two tasks with a prefered task to be completed after the less preferred task. Give fewer spelling works, math problems. Use distributed practive for rote tasks, rather than mass practice. Rules, expectations, and consequences should be clearly stated and specific.
Brief lessons result in greater learning.
Chunk learning tasks into small, well defined steps and present the information sequentially. Offer frequent visual, verbal, and physical feedback. Present information in an area where you can physically and visually reinforce concentration, and face the children directly. Modeling or demonstrating activities. Color code relevant features to capature the children's interest.