Yes you must know med math. If you're having trouble with it, you'll need to sit down with a nursing calculation practice book and practice, practice, practice. You're not only going to be dealing with meds dispensed by a Pyxis or similar. If you're an RN, you have to be able to calculate IV flow rates; 250 mg of K+ infused over 30 minutes is going to have a catastrophically different outcome than infusing the same amount over 24 hours. Also as patient advocates we are the last line of defense against med errors. It's your patients' lives and your license/livelihood at stake. Don't take a nonchalant attitude towards math. I know it's tedious and boring but it's absolutely necessary. As for the instructor who told you that you don't need to know med math, they need to be reported to your department chair.