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The "Highest Common Factor" of two (or more) numbers is the largest number that will divide into each of them. Examples: * The HCF of 15 and 21 is 3. * The HCF of 105 and 70 is 35. * The HCF of 154 and 455 is 1. Given two numbers /x/ and /y/ we have: * EQN:xy=hcf(x,y)~lcm(x,y) ---- This is related to: * Least Common Multiple This is used by: * Reducing Fractions to lowest terms * Cancelling fractions This uses * Divisors