Hardness or Difficulty in Math is a relative opinion. It becomes hard or difficult if we do not know what rules, principles and formulas are to be applied in a given problem. On the contrary, Math can be easy if we learn to master how these rules work and how to apply them.
Subject Math is difficult sometimes because we do not know what to do in a problem. Especially when we do not know the formulas. That's why in Math, we need to practice and to practice to enhance our skills in solving problems in Math. Hope it help :)