Much attention has been focused on Donald Trump’s use of words — that is, his peculiar style of oratory. But more attention should be paid to another feature of his discourse: his use of numbers.

The Powerball jackpot rose to $1.15 billion for the Monday, Dec. 15, drawing after no one on Saturday, Dec. 13, took home the top prize. If a ticket matches all five numbers plus the Powerball in the ...