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Website
Scholastic

Scholastic: Back to School Planning Guide

For Teachers Pre-K - 1st
Multiple back to school resources. Includes icebreakers, quick first day ideas, and unit plans.
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Interactive
New York Times

New York Times: Crossword Puzzle: Back to School

For Teachers 9th - 10th
The New York Times Learning Network has developed interactive and printable crossword puzzles. The theme of this one is Back to School.