my class has a wide range of ability, but i have a large group (nearly 1/3 of my students) who are seriously struggling with their numerical fluency in basic concepts... they don't know multiplication tables by memory (division therefore takes an eternity), get confused with place value very easily, and struggle with easy word problems. and that's just the tip of the iceberg. i have already started meeting with a group of them after school to reteach our 5th grade curriculum in a more concrete way for them, but i'm searching for ways to have them practice all those basics that they clearly don't have down yet. these are the kids that don't have extra time during the school day because they're slower workers, so i'm looking for homework-type practice that's a little more engaging that just worksheets and flashcards. any ideas??