Okay so I genuinely need help here because I am at my limit 
My 8 year old rushes through literally EVERYTHING. Homework, eating, getting dressed, you name it. Last week he handed in a worksheet where he wrote his name so fast it looked like a seismograph reading. His teacher actually called me about it. I sat him down, explained why taking your time matters, and he nodded like he totally understood. The next morning he brushed his teeth in 4 seconds flat and came downstairs with toothpaste still on his chin. I am not joking. Has anyone actually found something that works for kids like this? Not just “be patient” advice because I have tried patience and patience has not helped. I need real strategies from parents who have actually been through this.
Oh trust me you are not alone in this 
My daughter went through the exact same phase around that age. What actually helped us was making the task itself slower, not just telling her to slow down. We started doing what I call the “show me” rule. Before she moved on from anything, she had to show me one thing she checked. Did she check her bag was zipped? Did she re-read the last sentence? It gave her a mini pause without making it feel like a punishment. The trick is not to make a big deal out of it, just weave it into the routine. After about three weeks she started doing it on her own without being reminded. Kids that age are not being careless on purpose, they just genuinely do not see the point in slowing down when their brain is already three steps ahead.
Okay I have to ask, has anyone tried just… letting them fail? 
Like genuinely, my son rushed through a school project on volcanoes, turned in something that looked like it was done in a moving vehicle, got a C, and was devastated. That one C did more than six months of my lectures ever did. I am not saying let your kid tank their grades permanently but sometimes a natural consequence hits different than anything we say. The problem with us always catching the mistakes is that they never feel the weight of rushing. Once my son connected “I rushed” to “I got a bad grade and felt embarrassed,” he started caring. Not perfectly, but noticeably. Kids need to feel the cause and effect themselves sometimes.
With all due respect to Auralyte, the “let them fail” approach does not work for every kid. Some children just shrug off the bad grade and move on just as fast as they rushed the work lol. I tried that with my nephew and he genuinely did not care. What worked better for us was reframing what “done” means. Instead of “are you finished,” we started asking “is it your best?” It sounds small but it shifts the thinking from finishing a task to owning the result. We also put a physical timer on the table, not as a threat but just so he could see time passing. When kids can see time they relate to it differently. Abstract concepts like “take your time” mean nothing to an 8 year old. A ticking timer they can watch? That lands.
I work with kids as a tutor and I see this constantly. The rushing usually comes from one of two places: either the child is bored because the task feels too easy, or they are anxious and want to get the discomfort over with as quickly as possible. Figuring out which one it is makes a huge difference in how you address it. A bored child needs more challenge and engagement. An anxious child needs reassurance that mistakes are okay and that no one is waiting to judge them the second they finish. Before throwing strategies at the problem, try watching closely for a week. Does he rush more on things he finds easy or things he finds hard? That answer will tell you a lot about what is actually going on.
My kid used to rush because she felt like slowing down meant she was stupid. Like in her head, smart kids finish fast. Once I realized that was her logic I had to completely flip the script. I started praising slowness out loud. “Wow you really took your time on that, that is actually impressive.” I talked about how the best chefs, athletes, artists, all slow down on purpose. We watched a video of a surgeon doing a procedure (age appropriate obviously ) and I pointed out how slow and careful every movement was. She thought surgeons were cool so that actually stuck. You have to make careful feel aspirational for kids, not like a punishment or a sign that they are behind.
Honestly NexuForge is onto something with the timer thing. We did a version of this where my son CHOSE how much time he wanted to spend on something before starting. Not me setting a minimum, but him deciding. “How long do you think this deserves?” It gave him ownership. And then when he rushed and finished in two minutes when he had said five, I just pointed to the clock quietly. No lecture needed. He would usually go back and add more without me saying a word. Kids respond so differently when they feel like the standard came from them and not from you. The moment it becomes your rule it becomes something to push against. Make it their rule and suddenly they want to keep it.
Can we also talk about how WE as parents might accidentally be part of the problem? 
I realized I was always saying things like “hurry up we are late” and “come on come on” every single morning. My son was literally just mirroring what he saw at home. The whole house was in rush mode all the time. Once I started deliberately slowing myself down and narrating it out loud, “I am going to take my time making this coffee,” “I am not going to rush through this,” he started picking it up. Kids copy what they see way more than they follow what they are told. I am not saying this is definitely what is happening in your house but it is worth thinking about. Sometimes the fix starts with us before it starts with them.
Okay Silicrypte just called all of us out and I am not ready But real talk, everything being said in this thread is gold. One thing I want to add that nobody has mentioned is celebration. Not just correcting the rushing but making a genuine fuss when they do slow down. My daughter did one homework page neatly last month and I made it a whole event. We put it on the fridge. I texted grandma a picture of it. She was glowing for two days. The next homework session she sat down and goes “I want to put this one on the fridge too.” I nearly cried. Positive reinforcement sounds basic but most of us default to only reacting to the bad stuff. Catching them doing it right and making it feel special actually works when you are consistent about it.
I tried about four of the things mentioned in threads like this one over the years and I want to give a realistic update: some worked, some did not, and a lot depended on my kid’s mood that week lol. What I will say is that nothing worked overnight. The timer helped. The “is it your best” question helped. What did NOT help was making it a big emotional conversation every time he rushed. The more I made it a whole thing, the more resistant he got. Low key corrections with no drama attached landed better every single time. A quiet “go back and check one more thing” with no sighing, no eye rolling, no speech about responsibility. Just a calm short redirect. Kids that age are still figuring out how to regulate themselves and our calm literally helps their nervous system calm down too. Keep it boring. Boring works.
Late to this thread but I have to share because nothing I read online worked for my son and what finally did was completely random. He is obsessed with video games and I started comparing careful work to how he plays. In his favorite game he cannot just spam buttons, he has to actually time things and be precise or he loses. I said “you know how you slow down right before a boss fight because you know one wrong move ends the run? School works the same way.” He stared at me for a second and then said “ohhhh.” That was it. That was the click. Now when he rushes I just say “boss fight mode” and he knows what I mean. Find whatever your kid is into and draw the parallel there. Do not explain it in adult terms, explain it in THEIR world and it will make sense to them in a way that nothing else will. 