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 Challenge
 Number Sets:  A group of numbers that have a common property.

Those Fractions in Between: Find three different fractions between 3/5 and 2/3.

Rational or Irrational?: Determine whether ratios and fractions are rational or irrational.

Rationalize Pi: Approximate pi with a rational number.

Consecutive Sum: Given the sum of consecutive numbers, find the least of these numbers.

Greatest Product: Find the greatest possible product of two natural numbers who have a particular sum.

Integer Function: Find the smallest integer by substituting numbers into a fraction