How not to suck at maths?

Begin not sucking at maths.

Practice, I used to be pretty bad at maths but I learned how vital it was to a programmer so I took courses and started to practice, practice, practice. Now I think I'm half decent and it has helped me dealing with algorithms alot :)

Practice

Like the others said, practice is important. But more important than that is actually understand what you're doing. Before practicing, learn the concepts and explain them to yourself using simple words. If you can't, you probably need to read more about it.
Even a calculator can get results from formulas. You'll need more than that to be good at it.

The same applies to algorithms and science in general.

No shortcuts. That's what I love about maths. You just have to put the hours in.

Get a good book having lots of exercises and begin with the easy stuff. Many books have exercises which are categorised according to difficulty. So start with the easy ones and progressively move onto the difficult ones all the while asking yourself why a particular calculation is happening like it is and what are the real world implications to them.