Is it _supposed_ to fit on a 80 minute CD when burnt?
If so you shouldn't need to do anything to the BIN file. Open up the CUE file and check the filename given for the BIN is correct. If it's okay, select the CUE file in your CD burning app & burn it. Instructions for Nero here: click here
If it really is too big, split it up into chunks and burn those. Make sure son knows what to do when he get the CDs though. HJSplit: click here