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How Many Ways: Fraction Subtraction 234

How many different ways can you make this fraction subtraction statement true using only the digits one through nine?

Measurement: An Elephant

What if I told you that an elephant weighed a back-breaking 176,000? Could you figure out the unit I’m using? But… how many corgis would that be?

Math Curiosity: Primes and Squares

Can any perfect square be written as the sum of two primes?