I was solving some problems related to Karatsuba, when I came across a problem which says, how many multiplications would you need to multiply a large number divided into 3 smaller ones like this:
a = a0 a1 a2, for instance 102030 is a0=10 a1 = 20 a2=30, we do the same with another number.
How do I calculate the number of multiplications needed to multiply these 2 numbers?