The following is an excerpt from Thinking in Numbers: On Life, Love, Meaning, and Math, by Daniel Tammet, out now from Little, Brown.

Here’s a great question I got recently from a reader named David: “When it comes to numbers, I have always heard one through nine are to be spelled out and then 10 and on are to be numerals.

Word searches are fun. If they are number words, which can be found only by solving number riddles, the challenge and fun are increased.

New research with Amazonian villagers suggests that their language lacks number words but that they still comprehend precise quantities of objects.

Word searches are among the most popular puzzles, along with crosswords and Sudoku. Each consists of a square arrangement of letters that hides actual words among the seemingly random letters. The ...

Word Puzzle: Readers with a genius brain can solve the anagram in 4 seconds. Are you one of them? Test your intelligence now!

Twenty-four first-grade children were asked to write number sentences and select appropriate alternative number sentences for addition and subtraction word problems. Responses were qualitatively ...