Maths
Steve , sorry had to laugh at that "give you a flight computer " sorry matey heheh the day anyone in aviation "gives" you anything will be a turn up . The CRP/5 which is what you need costs around £35 if you plan on doing cpl you will need the crp/1 which is around £55 , check ebay athough cpl students snap em up .
TFDP , I have never passed a maths exam in my life nor do I ever think I will . I passed all my atpls and cpl/ir with very little understanding of maths and instructed the ppl cpl and ir with same lack of knowledge. The others are quite correct maths in the ppl is limited to additon and subtraction . There are instructors who try to make things more difficult than they should be the 1/60 rule can be expalined like quantum physics by some .
The whizz wheel is your friend take time to learn to use it and all will be well .
But do not let maths worry you