Get your class excited about math and aware of the season by using Halloween candy for math manipulatives. Here are some ideas:
You can use them for counting. Have students simply count them, or set them into groups using easily recognizable patterns like the dots on dice to help students recognize quantities quickly.
You can use them for patterning, having students reproduce patterns or create their own.
You can use them for place value, lining up ten of one kind of candy and showing that it equals one of another kind.
Carry it further by gathering ones and then using ones and tens to show the same quantity.
You can even show equations with candy if you choose it well!