Times tables booklets are a great tool for students to use to test themselves and review various table facts. http://topnotchteaching.com/lesson-ideas/times-tables/
Letter Recognition Activity Worksheets
Great math hack
The Teaching Thief: Representing Multiplication Multiple Ways
Multiplication/Division | The Little Learning Zone
This would be a great center activity for math while teacher is doing small group instruction! It takes multiplication from just recalling facts to a deeper level of understanding. LOVE! Multiplication of the Day for 3rd Grade!
Introduce division with hula hoops and manipulatives. Great blog for lesson plan ideas....lessonplansos.blogspot.com
Fractions: Here is a 23 page Pizza Fractions Unit. It focuses on the Common Core 3.NF - Develop understanding of fractions as numbers.
Using LEGO to Build Math Concepts arrays, mean, median, mode, range, fractions
Multiplying and dividing by 10, part 2