This is one of those standard genres for people who solve the Dutch magazine Breinbrekers. I always like them. And as it added come arithmetic to the puzzle set. I had never actually designed any before. I wanted to make it so there were no equal adjacent digits in the grid, in which I succeeded. Obviously I went for a sum of 24 for this puzzle. I though the grid layout made the place to start obvious, but I don't know you all will agree.
Divide the grid into the 12 pentominos. The 5 digits in the pentomino must add up to 24. (The example uses tetrominos and the sum is 10.