A single line is worth 1000 points.  A tetris is worth 8 times that much.   Tim scored 6 singles and 4 tetrises.  How many points did he score?
A tetris is worth 8*1000=<T>multiply(8, 1000)=8000 points
So he scored 4*8000=<T>multiply(4, 8000)=32000 points from tetrises
He also scores 6*1000=<T>multiply(6, 1000)=6000 points from singles
So in total he scores 32000+6000=<T>add(32000, 6000)=38000 points
