No, this isn’t meant to be another stupid post about how ppolee can raed setecnnes wehn the ltetres of ecah wrod are scamrbeld. But if you were paying attention, you may have noticed that the word *mathematics* was misspelled in the title.

In an ironic twist of fate, the word that I misspell most often is MATHEAMTICS. Sort of. It’s not that I mis*spell* it as much as I mis*type* it. For unobvious reasons, I tend to transpose the M and A in the third syllable. And statistically speaking, it stands to reason that I’d screw it up often — it’s a word I type frequently.

Spelling is important, as authors Robert Magnan and Mary Lou Santovec claim in their e-book *1001 Commonly Misspelled Words*. Spelling is so very important, in fact, they’ve taken great care in writing a description of their book for Amazon. Here’s an excerpt:

It seems that Magnan and Santovec should increase their list to 1003 words and add *memory* and *correct* (misspelled as “memeory” and “corret” in the excerpt above). And then at the end of the paragraph, it seems they’re trying to make a joke by spelling *knowledgeable* incorrectly but then correcting the spelling between the dashes; yet both instances are spelled the same — correctly, in fact — which I suspect was autocorrect fixing the deliberate misspelling before this blurb went to print.

One has to wonder if these mistakes were intentional, to keep the reader on her toes and emphasize how important spelling is. Sort of like the deliberate mistake in this proof that 1 = 2:

(For the infinitely geeky, there’s this follow-up, posted by Anders Kaseorg on Quora:

Suppose there are *n* proofs that 1 = 2. From this we derive that there are *n* + 1 – 1 = *n* + 2 – 1 = *n* + 1 proofs that 1 = 2. Therefore, by induction, there are infinitely many proofs that 1 = 2.)

But, I digress. My purpose in writing this post was to provide a list of hints for how to spell the most frequently misspelled math words. As it turns out, many of the math words that you’d think would be hard to spell — words with several syllables or lots of letters, like *parabola* or *triangle* or *differentiation* — are actually spelled exactly like they sound. Most of the really hard-to-spell math words are the names of mathematicians, like de Moivre, Poincaré, Weierstrauss, Euler, and Euclid.

The following are math words pulled from a variety of lists of commonly misspelled words.

**forth/fourth/forty** : there’s a *u* in the ordinal number, but not in the multiple of 10. To help you remember the difference, keep in mind that 40 is the largest number that, when spelled out, has all its letters in alphabetical order — and that won’t be the case if a *u* is included.

**twelfth** : there’s a little “elf” in *twelfth*, even if you incorrectly say “twelth” without the *f*.

**ninth / ninety** : fifth and fifty are parallel, in that both change *v* to *f* and drop the *e*. Sadly, ninth and ninety aren’t. Sorry, I don’t have any tips for remembering this one… except maybe that it’s on this list, which will help you remember that they’re spelled differently.

**existence** : one *i*, three *e*‘s, no *a*‘s.

**height** : the three dimensions are *length*, *width*, and *height*, not *heighth*, regardless of how my father pronounced it. There’s no *h* at the end.

**independent** : ants live in colonies, which isn’t very independent. That’ll help you remember that independent ends in –*ent*, not –*ant*.

**neighbor** : the *ei* takes on a long *a* sound, despite the *i* before *e* rule, and then there’s a silent *gh*. Yeah, lots of opportunities for goofing up this one. No one would fault you for spelling it *nayber*.

**operator** : when AT&T introduced the 1-800-OPERATOR promotion in the mid-1980’s, it was a disaster. The majority of would-be callers spelled *operator* with an *e* instead of an *o* in the last syllable.

**perseverance** : perhaps less mathy than the other words on this list, but Common Core includes it in Math Practice 1. There’s an *a* in the last syllable, and there’s no *r* before the *v*.

**principal/principle** : remember that Al wants to collect interest on his *principal* investment, but Lee likes the pigeonhole *principle*.

**similar** : another one that doesn’t have –*er* at the end.

[**Update 8/3/2015:** From the twitterverse, we have these additions to the list.

**perpendicular** : two *e*‘s, one *i*, not the other way ’round. @redbucwildcats

**mensuration** : not hard to spell, necessarily, but hard to pronounce. @pstni

**angle** : not *angel*. @mathsjem

**frustum** : *frustrated* has two *r*‘s, but *frustum* only one, thank you very much. @mathsjem

**parallel** : one *r*, two *a*‘s, three *l*‘s. @mathsjem

**correlation** : only double *r*‘s. @mathsjem]

*July 30, 2015 at 8:57 am*

In my professional career, I’ve had the pleasure to:

To say that I’ve been blessed in my professional career would be like saying that Leonhard Euler was pretty good at math.

I was blessed again recently, when former NCTM President Johnny Lott asked if I would lead a topic study group at the **13th International Congress for Math Education (ICME-13)**, which will be held July 24‑31, 2016, at Universität Hamburg, Germany.

Christian Mercat of University Claude Bernard Lyon 1 is my co-chair for **Topic Study Group 7: Popularization of Mathematics**.

**I would like to invite you to be my guest at ICME‑13 and to attend our topic study group. In addition, I welcome any suggestions you have of mathematicians or math educators who popularize mathematics. We are seeking papers and presentations from a diverse, global panel, and any and all recommendations are greatly welcomed. Please post your suggestions in the comments, or email me at patrick@mathjokes4mathyfolks.com. **

*January 27, 2015 at 8:24 am*