Title: Mnemonic Major System

Numeral: 0
Sounds (IPA): /s/, /z/
Commonly associated letter sounds: s, soft c, z, x (in xylophone)
Mnemonic and remarks: Zero begins with z (and /z/). Upper case S and Z, as well as lower case s and z, have zero vertical strokes each, as with the numeral 0. The alveolar fricatives /s/ and /z/ form a voiceless and voiced pair.

Numeral: 1
Sounds (IPA): /t/, /d/
Commonly associated letter sounds: t, d, th
Mnemonic and remarks: Upper case T and D, as well as lower case t and d have one vertical stroke each, as with the numeral 1. The alveolar stops /t/ and /d/ form a voiceless and voiced pair, as do the similar-sounding dental fricatives /th/ and /d-/, though some variant systems may omit the latter pair.

Numeral: 2
Sounds (IPA): /n/
Commonly associated letter sounds: n
Mnemonic and remarks: Upper case N and lower case n each have two vertical strokes and two points on the baseline.

Numeral: 3
Sounds (IPA): /m/
Commonly associated letter sounds: m
Mnemonic and remarks: Lower case m has three vertical strokes. Both upper case M and lower case m each have three points on the baseline and look like the numeral 3 on its side.

Numeral: 4
Sounds (IPA): /r/
Commonly associated letter sounds: r, l (as sounded in colonel)
Mnemonic and remarks: Four ends with r (and /r/ in rhotic accents).

Numeral: 5
Sounds (IPA): /l/
Commonly associated letter sounds: l
Mnemonic and remarks: L is the Roman numeral for 50. Among the five digits of one's left hand, the thumb and index fingers also form an L.

Numeral: 6
Sounds (IPA): /tS/, /dZ/, /S/, /Z/
Commonly associated letter sounds: ch (in cheese and chef), j, soft g, sh, c (as sounded in cello and special), cz (as sounded in Czech), s (as sounded in tissue and vision), sc (as sounded in fascist), sch (as sounded in schwa and eschew), t (as sounded in ration and equation), tsch (in putsch), z (in seizure)
Mnemonic and remarks: Upper case G and lower case g look like the numeral 6 flipped horizontally and rotated 180DEG respectively. Lower case script j tends to have a lower loop, like the numeral 6. In some serif fonts, upper case CH, SH and ZH each have six serifs. The postalveolar affricates /tS/ and /dZ/ form a voiceless and voiced pair, as do the similar-sounding postalveolar fricatives /S/ and /Z/. CHurch has six letters.

Numeral: 7
Sounds (IPA): /k/, /g/
Commonly associated letter sounds: k, hard c, q, hard g, ch (as sounded in loch),
Mnemonic and remarks: Both upper case K and lower case k look like two small 7s on their sides. In some fonts, the lower-right part of the upper case G looks like a 7. G is also the 7th letter of the alphabet. The velar stops /k/ and /g/ form a voiceless and voiced pair.

Numeral: 8
Sounds (IPA): /f/, /v/
Commonly associated letter sounds: f, ph (in phone), v, gh (as sounded in laugh)
Mnemonic and remarks: Lower case script f, which tends to have an upper and lower loop, looks like a figure-8. The labiodental fricatives /f/ and /v/ form a voiceless and voiced pair.

Numeral: 9
Sounds (IPA): /p/, /b/
Commonly associated letter sounds: p, b
Mnemonic and remarks: Upper case P and lower case p look like the numeral 9 flipped horizontally. Lower case b looks like the numeral 9 turned 180DEG. The labial stops /p/ and /b/ form a voiceless and voiced pair.