For years, a French mathematician searched for a proof that a gigantic number is prime. His method is still used 150 years ...

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Helping students to develop math fluency takes more than just flash cards. It requires teaching them how to think about ...

Erin Gobler is a personal finance writer based in Madison, Wisconsin. She writes about topics including budgeting, student loans, credit, mortgages, investing and insurance. Her work has been ...