To multiply 2/5 by 5/6, multiply the numerators (2 * 5 = 10) and the denominators (5 * 6 = 30). So, the product is 10/30. In simplest form, 10/30 can be simplified by dividing both the numerator and denominator by their greatest common divisor, which is 10. This gives us 1/3 as the final answer.
