The sub folder checklist
A sub day goes well or badly based on what is in one folder on your desk. This is the checklist I use to stock mine: a one-page printable you can pin inside your plan book, and the whole list is right here too, free to copy. Check things off as you go; the page remembers.
Download the printable checklist (PDF) One page, no sign-up.
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Before anything else
The work
The logistics
If the "five days of review-only work" line is the part your folder is missing, that is exactly what my Math Sub Plans bundle for grades 3 to 5 was built to be, and the math sub plans guide walks through the whole system.