Use for addition, subtraction -then discover how to set up for multiplication Math Facts Baseball - Practice addition and subtraction facts! There's a great statistics lesson in here too. This would really be a great project for any elementary grade.
The Fraction Pizza is an awesome way to differentiate when teaching fractions. Understand a fraction a/b with as a sum of fractions . Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.