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In the spirit of annual 3/14 Pi Day celebrations everywhere, we decided to do a tools grab-bag article again, but with a little flair. We've combed through the last twelve months of INSTRUCT newsletters--every single section, including "S'Cool Tools" and "Subject-Specific"--and found the five math products that made you the most click-happy.
Without further ado, we give you the top five most popular math tools from the last 365 days. And guess what? They're all free.