Square Root Question

What is the difference of the square root of 144 and the square root of 25?

In my ASVAB prep course, one of the topics I review is square roots.  I remind my students that knowing the perfect squares up to 144 (12 x 12) will help to improve their ASVAB math scores.  As an ASVAB tutor, I know that students need to be solid with times tables, squares, and square roots.  Cubes and cube roots are helpful too.  Do you know the answer to this problem?  I will share the answer tomorrow.