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.
Addition with 3 or More Addends. When you print these activities, you will notice that the problems have 3, 4, or 5 addends. Includes 1, 2, 3, and 4-digit numbers.
Writing Algebraic Expressions. Write simple expressions in algebraic form with a variable. 5th through 7th Grades.
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).