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Here are some Free TPT Resources for Halloween.
Halloween Writing Prompts

Measuring Ghosts and Spiders Activity

Halloween Noun Sorting

Reading Comprehension Halloween Passages and Questions

These websites have a collection of Halloween themed learning activities.

In particular I liked:

Most of these games will require enabling Adobe Flash.

Here are some options for Halloween music in class from YouTube: (Elementary sing along style) 

Halloween Songs from 100 years ago

Spooky instrumental background music

Here are some fun options to carve a virtual pumpkin with your kids.

Here are some digital coloring pages.
If you want to go old school there is also an option to print the coloring sheets. Virtual teachers you can assign these in ClassKick and have students color them digitally.

search Epic Books for tons of Halloween eBooks.

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Check out these Halloween Kids jokes for some cheesy fun.

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