In simplest form, what is 210/385?

1. Factor the numerator into primes: 210 = 2 x 3 x 5 x 7. 2. Factor the denominator into primes: 385 = 5 x 7 x 11. 3. Both the numerator and denominator share the factors 5 and 7. 4. Divide out the common factors of 5 and 7, leaving 2 x 3 over 11. 5. Multiplying the remaining factors gives 6/11. 6. 3/11 comes from dropping an extra factor of 2, and 6/7 comes from cancelling 11 instead of leaving it in the denominator. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 4 "Fractions", section 4.2 Multiply and Divide Fractions_