Researchers say students lose, on average, a month's worth of learning over the summer months. 

KCBS Radio's Rebecca Corral tells us that's why you may start seeing math problems on the ground outside.

Researchers say students lose, on average, a month's worth of learning over the summer months.&nbsp;
KCBS Radio's Rebecca Corral tells us that's why you may start seeing math problems on the ground outside.

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