Several keys on keyboard not functioning

Press the option key five times quickly, and see if the affected keys now work normally.

If so, then you just exited the “mouse keys” mode.

Mouse Keys mode allows you to operate without a mouse.

Control the pointer using Mouse Keys on Mac - Apple Support

photopiatx Said:

"Several keys on keyboard not functioning: how do i get back letter key function? i have lost uio 987 and lkj and .mn"

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Reset the NVRAM:

Use an external keyboard, and reset the NVRAM with it. Go Here: Reset NVRAM or PRAM on your Mac - Apple Support