Put those leftover must-haves to good use with these hacks.

As kids prepare to head back to class, shopping carts fill with essential supplies. According to the National Retail Federation, spending on supplies this year is expected to reach $83.6 billion, an increase of more than 10 percent over last year’s $75.8 billion. Leftovers? We're giving a pencil, an eraser, and a ruler a new assignment with these quick and easy household hacks.

Feeling the Back-to-School Chaos?

Get a list of these ideas and organize your family’s schedule with Cozi, a free shared calendar and list app from Time Inc. (available for iOS and Android).

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