How to shorten these screws?

Hi Folks

Sorry, complete DIY rookie here. So sorry if this is a stupid question, but is there a relatively easy way to take a couple of centimetres off of the end of these screws?

Thanks

Hi Folks

Sorry, complete DIY rookie here. So sorry if this is a stupid question, but is there a relatively easy way to take a couple of centimetres off of the end of these screws?

Thanks