This site has hundreds of basic multiplication activities. Printables include multiplication games, quizzes, word problem worksheets, cut_and_glue activities, flashcards, math mystery pictures, and much, much more.
4 and 5_Digit Addition. This page has resources for teaching addition with 4 and 5_digit numbers. Includes column addition exercises, an addition crossword, and word problems. (Approx. level: 3rd grade, 4th grade, 5th grade).