A first-grade student spells 'under' as 'umber.' The teacher has the student do what?

The teacher instructing the student to look in a mirror and pronounce /n/ and /m/ is focusing on helping the student understand the phonetic distinctions between these similar sounds. This method encourages the child to notice the articulatory differences in producing /m/ and /n/, reinforcing how those particular sounds are formed in the mouth and their place of articulation.

By visually monitoring themselves in a mirror while pronouncing these sounds, students can gain insights into their speech patterns and enhance their phonemic awareness. This understanding is crucial for spelling because it connects the letters to their corresponding sounds, aiding the student in recognizing why the correct spelling of 'under' contains the /n/ sound, rather than the /m/ sound they mistakenly used. This approach emphasizes mastery of phonological awareness, which is a key component of phonics and overall literacy development.