Say the word, keep only the consonant sounds you hear, and map each to its digit — vowels and h/w/y are silent.

This reverse drill trains decoding, the half you use when reading a memorised story back into digits. For a single-digit peg there's exactly one coded sound: strip the free letters and what's left names the number. The ten cards below are the classic single-digit pegs, asked in reverse.

0 — the only coded sound is soft-c /s/.

The vowels are free; the soft c is an /s/ sound, which is a 0.