"I am equal to the other two fellows," from School: A Monthly Record of Educational Thought and Progress, 1908.

An angel in the seventh heaven is said to have a rooster's shape (as per Romans de Mahon), but which is it — a rectangle or a triangle?  From A Little Journey Among Anconas by Cecil Sheppard, 1922.

You knew that everything is just a little bit better in Scandinavia, but here's why: How "No. 1" Became "1 1/2" in Norway by J. Maitland Stuart, 1891.  Now it becomes clear — when Norwegians "turn it up to eleven," it's a bigger deal.

Hey, let's take five and have these guys to do the math, eh?  "Appreciable only by mathematicians," from The Purchase of the North Pole by Jules Verne, 1891.

You do the math: "Two stockings and two shoes added together make a great many when one has the dawdles."  From St. Nicholas magazine, 1910.

Imagine our delight to see this marginalia: a reader attempted to divide infinity by seven!  From The mystic test book; or, The magic of the cards. Giving the mystic meaning of these wonderful and ancient emblems in their relationship to the heavenly bodies, under all conditions; with rules and processes for reading or delineating the emblems by Olney H. Richmond, 1919.

This unusual math problem is from a hilarious book that Jonathan Caws-Elwitt recommended, Three Rousing Cheers for the Rollo Boys by Corey Ford:

"Harry! Tom!"

"Dick! Tom!"

"Tom! Harry!"

"Stop!" cried Dick suspiciously; and, taking out a sheet of white paper, he wrote down: "Harry! Tom!" "Dick! Tom!" and "Tom! Harry!" He then added them together and divided through by Tom.

Answer: "The result is Harry and Dick," he said seriously. "Tom cancels." (The answer is in black text on the black background. Highlight it to view.)

Today we celebrate seven wonders of the world, but in the richness of the past there were nine.  From Across Three Oceans and Through Many Lands by Fred Reynolds (1898).  The caption reads: "One of the nine wonders of the world—the Taj Mahal."

In French, the equivalent expression to "If I've told you once, I've told you a thousand times" is "Si je l'ai dit une fois, je l'ai dit trente-six fois." Can you prove that the two numbers are indeed equivalent?Answer: Thirty-six and one thousand are equivalent for very small values of one thousand and very large values of thirty-six. (The answer is in black text on the black background. Highlight it to view.)

Thirty-six times! What moderate hyperbole! In some cases, it might even be an underestimate.