Common at younger ages. Important to correct it - and maybe practice writing it correctly.

Rebmun.

Suuper common. My oldest did it just long enough (2nd grade) that it was flagged as a concern so we did "sandpaper writing" and it worked like a charm.

Mildly dyslexic 1st grader does it too. I've been told for him it's pointless to correct him at this point because he doesn't see the difference.

Dd did this a bit through 4th though it trailed off more each year from doing it often in 1st. She's in middle school now and does fine in math.

^stopped