Your actual marks for your answers are converted to uniform marks, it's not vital to understand how since it's your uniform marks that are reported in your results. If you take higher papers the maximum uniform mark is 400. If you take all foundation papers the maximum uniform mark is 277. The minimum score for a C is 240. If your terminal paper is at Foundation then the maximum award is a C.
Robbo1 you got 239, missing a C by 1 uniform mark. I don't generally recommend remarks for GCSE maths but in this case you might want to ask your teachers about it.
Robfinlay you got 235, missing C by 5 uniform marks.
You are both very close to C so talk to your teachers about what your options are - a C will be very useful for future education or employment...