The tweet has been retweeted more than 2,000 times.
The spelling worksheet was sent home with a note which read: "For homework each week, I will be sending home six words from the recommended spelling test which I will then pick up in class the following work."
Four of the six words were spelled correctly: "accommodate", "communicate", "equip" and "physical".
A number of Amanda's followers tweeted their dismay with one calling the errors "appalling".
"There's no excuse anymore surely, what with spellcheck etc."
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Others shared their own experience with poor spelling and grammar from their child's teacher.
"Similar happens with the girls' homework, printed from online sources, littered with errors," wrote Donna Gallers.
One follower took a humourous approach, telling Amanda: "I hope you communicate them immediateley and accomadate a meeting to physically equip them with the facts. Sincereley."
But not everyone saw the funny side, or echoed the mother's dismay. Some instead accused Amanda of using Photoshop to alter the image, with one follower writing:
"I can't believe you faked that photo," Alex Winters wrote. "All in the name of ridiculing your son's teacher. She's going to be furious."
Amanda denied the claims, explaining: "This is unfortunately totally genuine. It was stuck into my 10-year-old son's literacy homework book. If you think it's fake then that's your prerogative. But it's not. I don't care if you think it's fake."
While she does reveal her son's teacher is male, she goes no further in outing the bad speller.
"I haven't shamed anyone as I have mentioned no names, the teacher or the school and, obviously, wouldn't name them on social media either."
She added that she would take up the issue with her son's school, stating she appreciated and valued teachers, but found the errors unacceptable.
Teachers also weighed in on the issue, some praising Amanda for highlighting the problem, others defending the teacher at fault.
Nicola Fisher told Amanda to ignore the criticism she received for sharing the image.
"I'm a teacher and I'm glad you're doing something about it," she said. "And I don't think you shamed anyone."
But Amanda Mannion wrote: "Speaking as a teacher, it was probably written at 2 am after marking 90 books and a bottle of red. Inexcusable all the same."
A little more digging revealed the true culprit. The boy had (presumably by accident) been given two copies of the homework - one which had correct spelling.
- nzherald.co.nz