units	tens	hundreds
1	A (alpha)	I (iota)	R (rho)
2	B (beta)	K (kappa)	S (sigma)
3	G (gamma)	L (lambda)	T (tau)
4	D (delta)	M (mu)	U (upsilon)
5	E (epsilon)	N (nu)	F (phi)
6	Û, ß (digamma)	X (xi)	C (chi)
7	Z (zeta)	O (omicron)	Y (psi)
8	H (eta)	P (pi)	W (omega)
9	Q (theta)	(koppa)	(sampi)

Description of system:

In addition to the 24 letters in the Ionic alphabet, three other letters used in some epichoric Greek alphabets are given numerical values:
-- digamma (looks like F and follows E),
-- Qoppa (looks like Q and follows Pi), and
-- Sampi (consists of a crescent with the convex side facing right and two diagonal lines towards the lower left, and follows Omega).

The values are:
Numbers 1 to 9:
Alpha, Beta, Gamma, Delta, Epsilon, Digamma, Zeta, Eta, Theta

Numbers 10 to 90:
Iota, Kappa, Lambda, Mu, Nu, Xi, Omicron, Pi, Qoppa

Numbers 100 to 900:
Rho, Sigma, Tau, Upsilon, Phi, Chi, Psi, Omega, Sampi

For example, 334 would be represented by Tau + Lambda + Delta, with a stroke to the right after the last letter (tld/); for numbers of one thousand and above, the letters are re-used but a stroke to the lower left indicates the higher value, Alpha as 1000, etc. (e.g., /a).

Fractions:

Fractions are expressed as sums of unit fractions (e.g., 1/2 + 1/3 are used to express 5/6). The unit fractions are expressed using the same characters as integers, with the addition of a diacritical mark to indicate the fractional nature of that value. Usage of these marks seems to have varied, but often an acute accent is used immediately after the character (or sometimes after a sum) to mark the numeral or sum as a fraction. Integers are sometimes differentiated from fractions by placing a bar, a dot, or another symbol over the integer.