A reciprocal in math is a number that is multiplied by another number to get the product of 1. Two numbers whose product is 1 are called reciprocal pairs. To find the reciprocal of a number, write the number as a fraction and flip the numerator and denominator. For whole numbers, write the number as a fraction first before flipping. To find the reciprocal of a mixed number, first write it as an improper fraction and then flip the numerator and denominator.