I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "The most commonly used reduction is a polynomial-time reduction. This means that the reduction process takes polynomial time. For example, the problem of squaring an integer can be reduced to the problem of multiplying two integers. This means an algorithm for multiplying two integers can be used to square an integer. Indeed, this can be done by giving the same input to both inputs of the multiplication algorithm. Thus we see that squaring is not more difficult than multiplication, since squaring can be reduced to multiplication."? 

Two mathematical operations that are effectively the same in difficulty is the process of multiplying and what operation?