Hey guys I have a question. So I am teaching a demo lesson on fractions for fifth grade, how to add unlike denominators to be specific. People have recommended I use fraction bars to teach the conceptual understanding based on common core's focus on teaching concept before traditional rules. The trouble is I'm starting to think this can only go so far. For example when I am teaching a problem like 3/7 + 2/4, is there really a way to teach using fraction bars? You eventually have to introduce the LCM method. So is fraction bars just a basis to start the subject? So far for my lesson I am introducing the conceptual reason why we have to find unlike denominator using a fraction bar example, but then I am teaching the LCM method. Is this ok?