I'm starting Health sciences next year and trying to pick my electives. If I take MATH 1LS3 do I also need to take 1LT3?

These courses are considered electives for the Health Sci Program, so you aren't required to take them to get to level 2.

It depends on what you want to do. If you're taking these courses to fulfill the prerequisites for second year math courses, you should take both of these maths in first year (there's also MATH 1A03, 1AA3 that you could consider too - the more theory-heavy stream of first year math).

They're electives, so it's really up to you if you want to to take them or not.

ok so I only need to take 1LT3 if I want to take upper year math then?

yes or 1aa3.

so is there really any point in taking 1ls3 without 1lt3?

yes, a math is required for pretty much all science programs. youre not in science so you dont need it. its up to you though

grad schools want (usually) 1 full year of math (or equivalent to 6 mcmaster units...2 semesters) ...just keep this in mind