Maths (am, is, are, am not, isn't, aren't) hard. It (am, is, are, am not, isn't, aren't) easy
Math isn't hard. It is easy
Maths is hard-математика-трудная it is not easy-она не лёгкая 2 вариант: maths is not hard-математика не трудная it is easy-это лёгкая