Each digit and specific letter have a corresponding sound.
They are pronounced similarly and they have a Memory "Peg".

1 = t or d
There is one down stroke in a typewritten T and D.

2 = n
There are two down strokes in a typewritten n.

3 = m
There are three down strokes in a typewritten m.

4 = r
The word "four" ends in r.

5 = L
Your five fingers, with thumb out, form an L.

6 = j, ch, sh, soft g
There are six letters in shucks, chucks, and j and g have a round base and a similar pronunciation.

7 = k, hard c, hard g
When moving two seven's around, you get a k, hard c and hard g with similar pronunciation/sounds.

8 = f, ph, v
The handwritten f looks like an 8 and f, ph and v have similar pronunciation/sounds.

9 = p or b
Hold 9 up to a mirror and you see a p and b. And, p have similar pronunciation/sounds.

0 = soft c, s, z
The final digit is 0 and the final letter is z and c, s and z have similar pronunciation/sounds.

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