Editing Mnemonic (section)

===For numerical sequences and mathematical operations===
Mnemonic phrases or poems can be used to encode numeric sequences by various methods, one common one is to create a new phrase in which the number of letters in each word represents the according digit of pi. For example, the first 15 digits of the mathematical constant [[pi]] (3.14159265358979) can be encoded as "Now I need a drink, alcoholic of course, after the heavy lectures involving quantum mechanics"; "Now", having 3 letters, represents the first number, 3.<ref>{{Cite web|url=https://mathworld.wolfram.com/PiWordplay.html|title=Pi Wordplay|first=Eric W.|last=Weisstein|website=mathworld.wolfram.com}}</ref> [[Piphilology]] is the practice dedicated to creating mnemonics for pi.

Another is used for "calculating" the multiples of 9 up to 9 × 10 using one's fingers. Begin by holding out both hands with all fingers stretched out. Now count left to right the number of fingers that indicates the multiple. For example, to figure 9 × 4, count four fingers from the left, ending at your left-hand index finger. Bend this finger down and count the remaining fingers. Fingers to the left of the bent finger represent tens, fingers to the right are ones. There are three fingers to the left and six to the right, which indicates 9 × 4 = 36. This works for 9 × 1 up through 9 × 10.

For remembering the rules in adding and multiplying two signed numbers, Balbuena and Buayan (2015) made the letter strategies LAUS (like signs, add; unlike signs, subtract) and LPUN (like signs, positive; unlike signs, negative), respectively.<ref>{{Cite journal|last1=Balbuena|first1=Sherwin|last2=Buayan|first2=Morena|date=January 2015|title=Mnemonics and Gaming: Scaffolding Learning of Integers|url=http://apjeas.apjmr.com/wp-content/uploads/2015/01/APJEAS-2.3-Revised-Mnemonics-and-Gaming1.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://apjeas.apjmr.com/wp-content/uploads/2015/01/APJEAS-2.3-Revised-Mnemonics-and-Gaming1.pdf |archive-date=2022-10-09 |url-status=live|journal=Asia Pacific Journal of Education, Arts and Sciences|volume=2|issue=1|pages=14–18|issn=2362-8022}}</ref>

{{lang|fi|PUIMURI}} ('[[threshing machine|thresher]]') is a Finnish mnemonic regarding [[electricity]]: the first and last three letters can be arranged into the equations <math>P = U \times I</math> and <math>U = R \times I</math>. (The letter ''M'' is ignored, which can be explained with another, politically incorrect mnemonic.)<ref>[https://web.archive.org/web/20230412115012/https://huhtama.kapsi.fi/ele/index.php?si=ml16.sis Harraste Elektroniikka – PUIMURI – Sähkötekniikan alkeet] (in Finnish, archived)</ref>