Grade school girl gets marked down on her math test even though her calculation was perfect and she showed her work.
As we’ve seen on multiple occasions, some Japanese teachers are extremely strict not just about their students getting the right answer, but in how they arrive at it. For example, just a few months ago we looked at a situation where a kid got marked down for not using the needlessly complex “cherry calculation” method to do basic arithmetic problems.
But today’s topic is on yet another plane of nitpicking. Take a look at this word problem the daughter of Japanese dad and Twitter user @sashishi_EN was asked to solve. The scenario was about making donuts and pudding, with 2/8 of a liter of milk required for the donuts, and 5/8 of a liter for the pudding. @sashishi_EN’ daughter had to figure out how much milk, in total, was needed.
は!??うそやろ??
— サシシ (@sashishi_EN) April 24, 2019
うちの娘、分数の線を定規使わずに書いてるってバツにされてるんだけど!! pic.twitter.com/qRWWXdQk8n
The instructions said for her to show her work, which she did, writing in black pencil. Next to the kanji character 式 in the above photo we can see that she wrote “2/8 + 5/8 = 7/8,” and then at the end, next to 答え, she wrote the final answer, “7/8.”
And yet her teacher still marked her wrong.
Why? According to the teacher’s feedback, written in red ink to the right of the girl’s formula:
“Let’s use a ruler.”
Yep, the poor girl got marked down on her math test because the lines in the middle of her fractions weren’t perfectly horizontal. Never mind that the girl’s notations are completely legible and understandable, or that her actual math is entirely correct. Her penmanship is less than printing press-precise, and that just won’t do.
“What!??” tweeted incredulous dad @sashishi_EN. “You’ve got to be kidding me, right??”, and others who saw his tweet were equally baffled, commenting
“I don’t see anywhere on the paper where it says ‘Use a ruler.’”
“This is clearly the wrong method to tech kids. If the student is a little obsessive, she’ll focus too much on drawing the line straight and won’t be able to concentrate on the calculation. Having to grab a ruler every time just to draw a line will also take much longer, and she might not have time to finish the test within the allotted time.”
“You should totally call the school and complain about this. They might saw you’re overreacting, but I feel bad for your kid being treated like this.”
Alternatively, one commenter said that if the teacher wanted students to use a ruler so badly, they should write their formulas like this.
https://twitter.com/c_alex_x/status/1121295428237123585Now in all fairness, it is possible that even though it’s not written on the portion of the test that can be seen in @sashishi_EN’s photo, the teacher may have otherwise told the students that they had to use a ruler to draw their fraction lines. Yes, that feels like a pretty arbitrary requirement, but teaching kids the importance of listening and following directions is an important part of early child education. But it’s also important for teachers to practice what they preach and serve as good examples of the behavior they expect from their students, and taking another look at the paper, when the teacher wrote “Let’s use a ruler” (じょうぎを使おう in Japanese)…
は!??うそやろ??
— サシシ (@sashishi_EN) April 24, 2019
うちの娘、分数の線を定規使わずに書いてるってバツにされてるんだけど!! pic.twitter.com/qRWWXdQk8n
…the teacher’s writing is noticeably drooping at the end, and is far less level than the line in the fraction of @sashishi_EN’s daughter’s final answer. As such, the “Let’s use a ruler requirement” seems not just silly, but hypocritical too, since the teacher is apparently well aware that getting out a straightedge is sometimes a pointless hassle.
When silly school rules crop up, there’s often a chance that the teacher who’s enforcing them didn’t have any part in making them, and has their hands tied with a restrictive curriculum or conduct policy they’ve been assigned by their bosses. In this case, though, the straightness of fraction lines seems like a definite judgement call by the teacher, and a pretty meaningless thing to be fixating on.
There is, thankfully, one silver, or perhaps red, lining to all this. As @sashishi_EN points out, the red “Let’s use a ruler” comment is from the teacher, but the red numbers, with their straighter fraction lines, were written by his daughter, which implies that she was at least given the chance to go back and “correct” her mistakes, even if most people would say she didn’t do anything wrong in the first place.
Source: Twitter/@sashishi_EN via Hachima Kiko
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!
You don’t need to use a ruler when following Casey on Twitter.

Japanese student told they will be penalized for not using a ruler to draw multiplication lines
Japanese girl can’t think of anything to write about for in-class essay, writes awesome one anyway
Don’t like trigonometry? Then you’re just like Hitler, says Japanese high school English teacher
“Peaceful life with many dogs” is unacceptable dream, Japanese high school teacher tells student
Manga artist wants Japanese teachers to feel, for two seconds, how dumb their girls’ dress code is
Nike x One Piece collection brings Devil Fruits to sneakers and streetwear in Japan
Nephew of Studio Ghibli director Hayao Miyazaki serves up Totoro Shaved Ice in Tokyo
Nagoya’s famous Shinkansen platform noodle shop has other, better branches nearby
Winnie the Pooh cosplays as Yuzuru Hanyu for new plushie collaboration
Pikachu and other Pokémon evolve into hydration types with Thermos drinkware collaboration [Pics]
Osaka Starbucks has one of the city’s coolest photo vantage points, but it’s going away soon
Japan’s double-decker portable rice cooker/bento maker is better than ever with new version
Data suggests increased bear sightings have led to a decrease in mountain climbers across Japan
We recommend not buying one pack of Japan’s new convenience store corn soup-flavor fried chicken
Turn octopus, spaghetti, and more of your favorite foods into crackers with Senbei Maker 2
7-year-old boy left behind on Mt. Fuji by his own dad
Sushi Bus: Japan’s first conveyor-belt bus lets you eat sushi while sightseeing around Tokyo
12-year-old British girl who went missing in Tokyo found safe after visiting anime sites around Yokohama
Studio Ghibli unveils new interactive stationery dioramas that bring anime movies to life on your desk
Studio Ghibli composer Jo Hisaishi just set three Guinness Records
Anime fans can now wear a Seiko watch inspired by Japan’s One Piece Shinkansen
7-Eleven Japan brings back best-selling flat croissant that became a hit on social media
Foreign hiker on Mt. Fuji loses consciousness and dies, becoming climbing season’s second fatality
Universal Studios Japan partners with manga horror master Junji Ito’s Tomie
Japanese workers reveal their top five mysterious rules they wish would disappear【Survey】
Air-conditioned dress shirts arrive in Japan to save working professionals from sweltering heat
Pokémon Center Online designates first Pokémon items that will require Japanese ID card to buy
Japanese toilet aims to attract foreign tourists but not everybody is happy about it
Tokyo’s newest viral dessert is like a Japanese parfait inside a bread bun [Taste test]
New Japanese vending machine at Shinkansen station sells cups of ice on platform
Study finds hundreds of people in Indonesia legally named after Naruto, Inuyasha, other anime stars
Japanese vending machine sells freshly squeezed lemon juice with a futuristic light show
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Tokyo subway installing new ticket gates that don’t accept payment through Suica or other IC cards
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
Japanese teacher simply asks to be treated like a human being
Japanese teacher gives secret love letter to junior high schoolgirl, gets his heart broken
Teacher in Japan literally picks up truant kid, carries him out of house to make him go to class
Educator offers advice for Japanese schoolgirls who get asked out by their teachers
Japanese school bans non-white masks for students, teacher can’t believe dumb waste of time
Japanese teacher beats up student for making fun of his body by calling him anime character name
Flexible teachers DO exist in Japan: First-grader gets full credit for “wrong” math test answers
Japanese school teacher in hot water for knocking student’s face against chalkboard, other abuse
9+3=12? Nope, that’s wrong, says Japanese kid’s elementary school, thanks to “cherry calculation”
Japanese school has ridiculous reason for not letting cold schoolgirl wear tights under her skirt
Japanese teacher apologizes for peeing on students’ futon during club retreat
Teacher says Japanese schools’ mandatory extracurricular activity rules don’t benefit students
Japanese elementary school kid says 12 x 25 = 300, teacher doesn’t say he’s answered correctly
Japanese junior high school student pranks teacher by lacing school lunch with laxative
Awesome Japanese elementary school teacher rewards kids who use independent learning on his tests