Final answer:
The reciprocal of the number 18/7 is 7/18, which is obtained by flipping the numerator and denominator of the fraction.
Step-by-step explanation:
To find the reciprocal of the number 18/7, you simply flip the numerator and the denominator. The reciprocal of a fraction a/b is b/a. Therefore, the reciprocal of 18/7 is 7/18.
The concept of reciprocal is fundamental in mathematics, especially when it comes to division and multiplying fractions. If you multiply a number by its reciprocal, you get 1. Remember, any non-zero number has a reciprocal, but zero does not have a reciprocal because division by zero is undefined.