Käänteislukema

Käänteislukema is a Finnish term that translates to "reciprocal" in English. It refers to a number that, when multiplied by another number, results in 1. For any non-zero number x, its reciprocal is denoted as 1/x or x⁻¹. The reciprocal of a fraction a/b is b/a, provided that a and b are not zero. Division can be understood as multiplication by a reciprocal. For example, dividing by 5 is the same as multiplying by 1/5. The concept of a reciprocal is fundamental in arithmetic and algebra, appearing in operations like solving equations and working with rational expressions. The reciprocal of 1 is 1, and the reciprocal of -1 is -1. Zero does not have a reciprocal because division by zero is undefined.