Final answer:
Magnetism is the property that allows for easy separation of sand and iron filings.
Step-by-step explanation:
The property that would allow a student to easily separate sand and iron filings is magnetism.
Since iron is a magnetic material and sand is not, a magnet can be used to attract and separate the iron filings from the mixture. The iron filings will be attracted to the magnet, while the sand will remain unaffected.