## 0992: "Mnemonics"

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### Re: 0992: "Mnemonics"

Part of doing a chemistry subject at uni (a filler subject in a science degree) was a requirement to learn part of the periodic table (Hydrogen, Helium, Lithium etc).

Here was my slightly weird attempt at memorising it:

Harry, He Likes Beer But Can Not Open Fosters - Never mind, Nancy hands over a Mug

(Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Flourine, Neon, Sodium(Na), Magnesium)

(Fosters = Australian brand of beer)
StuartP

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### Re: 0992: "Mnemonics"

mattcoz wrote:
xorsyst wrote:I agree it should be avoided, but BODMAS gives us a definite order or precendence for it.

Except that it doesn't. This is demonstrated by replacing division with multiplication and vice versa.
10 / 5 * 2 --> 10 * .2 / .5
If division took precedence over multiplication, the result would be 1 instead of 4. So multiplication and division must always be done left to right.

How do you get that? 0.2 / 0.5 = 0.4 and 10 * 0.4 = 4.

If you have a chain of multiplications and divisions, doing them all left-to-right will give you the same result as doing the divisions first (in left to right order) and then doing the multiplications. So it doesn't matter which of those two systems you use, as long as you use it correctly. Personally I'd expect the first way to be easier to learn and to execute correctly, but that may just be bias due to having learned it that way myself.
scarletmanuka

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### Re: 0992: "Mnemonics"

Do kids prefer Coke over Fanta grape soda? Domain kingdom phylum class order family genus species.

rodneyAnonymous

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### Re: 0992: "Mnemonics"

At school (in the UK) in the '90's, I learned the planets by: "My Very Easy Method Just Speeds Up Naming Planets...!"

No asteroids or accounting for trans-Neptunian controversy though...! :/
Smoli

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### Re: 0992: "Mnemonics"

Shadowtail24 wrote:I volunteer in a 5th grade classroom and I learned the other day that PEMDAS is now GEMDAS (Grouping, etc). GEMDAS is much harder to mnemonize.

I teach high school mathematics and I tell my students that "PEMDAS" is for middle schoolers - GSERMDAS is a more accurate mnemonic for:

Order of Operations:
1. Grouping Symbols (innermost first)
3. Multiplication/Division from left to right

I personally like it because each level of priority gets two letters, but I'm sure most of my students who need a mnemonic still think PEMDAS to themselves.

And yes, "Division & Multiplication" in that order did bother me, but I didn't honestly notice it until a former student pointed it out when I posted a cropped version of the image ...

EDIT: Also forgot to mention that the two operations per level helps stress inverse operations - generally, you evaluate expressions (arithmetic) going down order of operations, but you solve equations (algebra) by reversing order of operations .... I call this the "Socks-and-Shoes Rule" ... hopefully some of this makes them better at mathematics

mootown2

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### Re: 0992: "Mnemonics"

Make them rhyme...

Chant the Ordered Sequence Downward
Cambrian to Present Time
Just in Case Past Eons' Order
May be Put from Prose to Rhyme

Only the capitals are used; we have 'Recent' instead of 'Holocene', and the Paleocene (Past) mucks up the scansion. Can you fix it?
Richard Kirk

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Joined: Mon Oct 11, 2010 7:18 pm UTC

### Re: 0992: "Mnemonics"

I registered just to say this.

Big Bears Run Out Yelling 'Go Buy Vintage Goose Whistles!!'
flyingcow93g

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### Re: 0992: "Mnemonics"

How do you remember that "Big Bears [...] Buy" is not, say, blue-black-brown? Or tell the B's apart in any of these mnemonics for resistor colors, I guess.

rodneyAnonymous

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### Re: 0992: "Mnemonics"

It goes from darker to lighters. Black, Brown, ect.
flyingcow93g

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### Re: 0992: "Mnemonics"

A good one for carbon chain prefixes is: My Elderly Parents Beat Poor Helpless Hopeless Orphans Near Death.
Methyl-, Eth-, Prop-, But-, Pent-, Hex-, Hept-, Oct-, Non-, Dec-
poofyfifi

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### Re: 0992: "Mnemonics"

Given Marx's general impecunious state and reliance on industrialist buddy cooking books, I think coming up with Zeppelins is a little unlikely: "Karl Marx Got Twenty Pounds Engels Zeroed Yearly".
Last edited by mixh on Sat Dec 31, 2011 6:36 am UTC, edited 1 time in total.
mixh

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### Re: 0992: "Mnemonics"

My "new" favorite mnemonic for the planets is from The Colbert Report, specifically right when it was announced that Pluto was being downgraded to a Dwarf Planet:

"My Very Educated Mother Just Said, 'Uh-oh! No Pluto!'"

Kichigai

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Location: New Jersey

### Re: 0992: "Mnemonics"

littledman wrote:... and that's why y'all should switch to Polish Notation. No ambiguity, easy to program with, and understood by nobody

There was an excellent SOH-CAH-TOA song that I heard many many years ago in a folk/hippy style. Can't find it. But I learned this sin/cos memory trick from an excellent high school physics teacher: "Father Sine, Holy Cos". Cross yourself while reciting this trig prayer and you have the axes for each!

I actually showed my work once like that on a math exam (after a few nights without sleep, and far too much LISP programming). The prof put question marks, then crossed them out and wrote a smiley face next to my work. Once you work like that for a while, it makes total sense.

Also, on the pi discussion, I'm firmly in the easily-remember-number-strings category (3.1415926535897932384626433832 from memory. I actually had it up to 60+ digits at one point. We had a competition, and I won an apple pie?. )
Socks

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### Re: 0992: "Mnemonics"

Belial wrote:The next person to post the old, shitty misogynistic (and intermittently racist) resistor code like they're being adorably transgressive or otherwise wax excited about it is going out the door.

Wow, I had no idea this forum was so obsessively ...Hold on, I think I swallowed a gerbil. Okay. What was I saying?. I feel regret and sadness for ever posting here.
lgw

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### Re: 0992: "Mnemonics"

When I was an Electrical Engineering student, I also learned the profane mnemonic for resistor colors. A professor taught the following, though:

B.B. Roy, Great Britain, Very Good Worker

Wasn't as helpful as the other, but at least I had a clean one to keep in mind.
dchmello

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Joined: Wed Dec 28, 2011 12:38 am UTC

### Re: 0992: "Mnemonics"

lgw wrote:I feel regret and sadness for ever posting here.
Your absence will not be noticed.
In the future, there will be a global network of billions of adding machines.... One of the primary uses of this network will be to transport moving pictures of lesbian sex by pretending they are made out of numbers.
Spoiler:
gmss1 gmss2

gmalivuk
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### Re: 0992: "Mnemonics"

Geologic mnemonic for Paleozoic: "Can our sly dog miss pet practice?" My field partners came up with that one.
stephenhfoster

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### Re: 0992: "Mnemonics"

For trigonometric identities, trust a class of 25 hormone filled adolescents to come up with:

Sex On Horseback Can Actually Happen To Our Amazement

Never again will the class be asked for suggestions...
krollipop

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### Re: 0992: "Mnemonics"

It's supposed to be NINE PIZZAS.

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soren121

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### Re: 0992: "Mnemonics"

I'm a geologist and I study that! (Points at ground)

I was once told a mnemonic for the paleozoic:
Campbell's Onion Soup Does Make Peter Pale
Cambrian Ordovician Silurian Devonian Mississippian Pennsylvanian Permian

*The Carboniferous is usually split up into the Mississippian and Pennsylvanian
MicroPaleontologist

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### Re: 0992: "Mnemonics"

My partner, who was tutoring high-school students at the time, always used:

Keep Putting Condoms On For Great Sex

for

Kingdom Phylum Class Order Family Genus Species

I liked that it was simple and served the double purpose of science memorization and "safe sex reminder". Also, it certainly seems to stick in the students minds.
ellenmaclean

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### Re: 0992: "Mnemonics"

About 30 years ago, our lecturer gave us this vintage mnemonic from his generation of valve circuit designers:

Of course, that was offered as a ...Hold on, I think I swallowed a gerbil. Okay. What was I saying? alternative to the rude one, and aren't rude mnemonics the only ones worth remembering?
Hotchy

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### Re: 0992: "Mnemonics"

krollipop wrote:For trigonometric identities, trust a class of 25 hormone filled adolescents to come up with:

Sex On Horseback Can Actually Happen To Our Amazement

Never again will the class be asked for suggestions...

Funnily enough, a book I read once suggested "Sex On Holidays Can Advance Happiness To Outrageous Amplitudes".
pollywog wrote:
Wikihow wrote:* Smile a lot! Give a gay girl a knowing "Hey, I'm a lesbian too!" smile.
I want to learn this smile, perfect it, and then go around smiling at lesbians and freaking them out.

ConMan

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### Re: 0992: "Mnemonics"

MS-ABC (as opposed to the Lefty news channel)

Socks wrote:Also, on the pi discussion, I'm firmly in the easily-remember-number-strings category (3.1415926535897932384626433832 from memory. I actually had it up to 60+ digits at one point. We had a competition, and I won an apple pie?. )

I have always had it to 25, can never seem to reliably keep more than that. Considering that's sufficient for a 3 foot error in calculating the circumference of the known universe, it's good enough for ballpark calculations on the backs of envelopes...

I first learned it back in 1974, when a friend of mine decided he was going to get into Guiness BoR which listed 700 digits as the record. He had it memorized up to 1000 digits by the time the next edition came out, when it was upped to 2000 digits. He gave up.

OBloodyHell

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### Re: 0992: "Mnemonics"

I fondly remember one of my math teachers giving us a mnemonic for sine cosine and tangent as "Some Old Hippie Caught Another Hippie Tripping On Acid."

As a math tutor, I can vouch that this IS the best way to remember it. Saying "Sohcahtoa" as one long word isn't nearly as effective.

Also, on the pi discussion, I'm firmly in the easily-remember-number-strings category (3.1415926535897932384626433832 from memory. I actually had it up to 60+ digits at one point. We had a competition, and I won an apple pie?.

e is so easy to remember to 15 digits.
"2.7" = 2.7
"Two Andrew Jacksons" (he became president in 1828) = 18281828
"equilateral right triangle" = 459045

Not that many people even in the USA know from memory that Andrew Jackson's tenure in office started in 1828, but the main is that the same 4 digits happen twice which makes it easier to memorize.
Kaiman

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### Re: 0992: "Mnemonics"

MS-ABC (as opposed to the Lefty news channel)

Socks wrote:Also, on the pi discussion, I'm firmly in the easily-remember-number-strings category (3.1415926535897932384626433832 from memory. I actually had it up to 60+ digits at one point. We had a competition, and I won an apple pie?. )

I have always had it to 25, can never seem to reliably keep more than that. Considering that's sufficient for a 3 foot error in calculating the circumference of the known universe, it's good enough for ballpark calculations on the backs of envelopes...

I first learned it back in 1974, when a friend of mine decided he was going to get into Guiness BoR which listed 700 digits as the record. He had it memorized up to 1000 digits by the time the next edition came out, when it was upped to 2000 digits. He gave up.

Yes, and 3.1415926 will give you the circumference of the earth to within a half meter, which should be good enough for all practical purposes. . . .

But it doesn't do much for geek bragging rights.
"The position was well put indeed in a famous speech by Jzbl to the graduates of the Central Saturnian University, when he said that it was a source of great pride to him that although hardly anybody knew anything any longer, everybody now knew how to find out everything."

bmonk

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### Re: 0992: "Mnemonics"

jsabrown wrote:My female circuits teacher taught us "bad boys race our young girls but violet generally wins."

I always thought circuits were gender neutral.
cd880b726e0a0dbd4237f10d15da46f4

Kisama

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### Re: 0992: "Mnemonics"

Kisama wrote:
jsabrown wrote:My female circuits teacher taught us "bad boys race our young girls but violet generally wins."

I always thought circuits were gender neutral.
For some unfathomable reason I now have an image of the cover of a book entitled "Harry Potter and the circuits of gender", by JK Flip-Flop
Lost Greatest Silent Baby X Y Z. "There is no one who loves pain itself, who seeks after it and wants to have it, simply because it is pain..."

Red Hal
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### Re: 0992: "Mnemonics"

Kaiman wrote:e is so easy to remember to 15 digits.
"2.7" = 2.7
"Two Andrew Jacksons" (he became president in 1828) = 18281828
"equilateral right triangle" = 459045

Not that many people even in the USA know from memory that Andrew Jackson's tenure in office started in 1828, but the main is that the same 4 digits happen twice which makes it easier to memorize.

It's easier for Russians. 1828 is Leo Tolstoy's birth year.

Kit.

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### Re: 0992: "Mnemonics"

MS-ABC (as opposed to the Lefty news channel)

And for the other 8?
In the future, there will be a global network of billions of adding machines.... One of the primary uses of this network will be to transport moving pictures of lesbian sex by pretending they are made out of numbers.
Spoiler:
gmss1 gmss2

gmalivuk
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### Re: 0992: "Mnemonics"

gmalivuk wrote:
MS-ABC (as opposed to the Lefty news channel)

And for the other 8?

What other 8 - everyone knows that REAL Canada starts in Manitoba. Ontario and the rest of them are just poseurs.
"Greyarcher":Trying to build a proper foundation for knowledge is blippery.
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eran_rathan

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### Re: 0992: "Mnemonics"

The geologic one is way too hard. How about something like:
People Can Order Spaghetti Dinner Carefully, Permitting That Jackalopes Can Prance Nightly;
or, Placing Cookies On Sweet Dark Chocolate Pieces Tastes Juicy, Can Please Nightly
(Precambrian Cambrian Ordovician Silurian Devonian Carboniferous Permian Triassic Jurassic Cretaceous Paleogene Neogene)

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### Re: 0992: "Mnemonics"

Well, I learned the profane version of the "Bad Boys" mnemonic in 10th grade electronics class from the teacher. This was in 1970. Yes it is sexist and mean, but boy I sure to remember how to read the color coding of resistors!
UncleJeremy

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### Re: 0992: "Mnemonics"

Yes, I am a Massage Therapist, so in school we learned a few for the hip:

Hip External Rotator Muscles : Pretty GOGO Queen
Prirformes
Gemellus Superior
Obturator Internis
Gemellus Inferiror
Obturator Externis

Gracilis
Pectineus
deganu

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### Re: 0992: "Mnemonics"

AvatarIII wrote:the only mnemonic i know for planets was always Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto,

Having mentioned that it made me remember seeing a comedy or something once where someone was taught a mnemonic and when asked to recite the mnemonic, he had to recite the actual list of what the mnemonic was supposed to help with first as a way to remember the actual mnemonic, I can't remember what it was though.

Who ever that is, I will go sit in the corner with them.
Why memorize some stupid thing so that I can remember some smart thing?

The Cranial Nerves were the Only time it almost worked.
Some thing about a Finn and a German having a beer on Mt. Olympus.
Sounded like a nice afternoon.

Do you know about those freaky-deaky optic and olfactory nerves?
Don't think about it. No good can come of it.
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### Re: 0992: "Mnemonics"

Kaiman wrote:... "equilateral right triangle" = 459045 ...

Woah... in what geometry is it possible to have (a) an equilateral right triangle, and (b) one with the angles 45, 90, 45? I'm thinking the surface of a sphere for (a), for example two meridians at 90 degrees and the equator. But that would contain three right-angles.
orthogon

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### Re: 0992: "Mnemonics"

"Isosceles" is obviously what was meant.
In the future, there will be a global network of billions of adding machines.... One of the primary uses of this network will be to transport moving pictures of lesbian sex by pretending they are made out of numbers.
Spoiler:
gmss1 gmss2

gmalivuk
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### Re: 0992: "Mnemonics"

gmalivuk wrote:"Isosceles" is obviously what was meant.

I guess you're right, but I just thought I'd pick up what he/she actually wrote and run with it. Just for giggles. The universe isn't Euclidian anyway, or so I'm told.
orthogon

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### Re: 0992: "Mnemonics"

Kaiman wrote:"Two Andrew Jacksons" (he became president in 1828) = 18281828
"equilateral right triangle" = 459045

Not that many people even in the USA know from memory that Andrew Jackson's tenure in office started in 1828, but the main is that the same 4 digits happen twice which makes it easier to memorize.

Actually, Jackson was first elected President in 1828 *, but didn't become President until March 1829.

* - although he won a plurality of both the popular vote and electoral votes in 1824.

orthogon wrote:
Kaiman wrote:... "equilateral right triangle" = 459045 ...

Woah... in what geometry is it possible to have (a) an equilateral right triangle, and (b) one with the angles 45, 90, 45? I'm thinking the surface of a sphere for (a), for example two meridians at 90 degrees and the equator. But that would contain three right-angles.

In response to the first part of your question, you can have an equilateral right triangle in spherical geometry, but it has three 90-degree angles. I'm sure there are other (irregular?) geometries with 45-90-45 equilateral right triangles...
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