How many phonemes are in the word instruction?

Let's break down the word "instruction" to count the phonemes:

* in - /ɪn/ (1 phoneme)

* struc - /strʌk/ (1 phoneme)

* tion - /ʃən/ (1 phoneme)

Adding the phonemes together, we get 1 + 1 + 1 = 3 phonemes.