Karatsuba’s “divide-and-conquer” multiplication algorithm has its roots in a method that Carl Friedrich Gauss (1777-1855) introduced involving the multiplication of complex numbers.

Study proposes a communication-efficient, divide and conquer algorithm that combines information from sub-machines using confidence distributions. The theoretical relationship between the number ...

It only makes sense, then, to stress when teaching students to divide whole numbers that dividing by any number is the same as multiplying by that number’s reciprocal. Example: 24 ÷ 6 = 24 x 1/6.