Are Kids Actually Taught New Math or Common Core? A 4th Grade Teacher Breaks It Down
Last Tuesday, I was packing up my classroom after after-school tutoring, brushing goldfish crumbs off the kidney table and shoving leftover construction paper into the art bin, when Mia knocked on the door. She’s the mom of Jax, my 4th grader who’s been struggling with homework anxiety this semester, and she was holding his crumpled math worksheet like it was a piece of evidence. “Can we just talk for a minute?” she said, pulling a chair out and sitting down next to Jax, who immediately slouched and started picking at a loose seam on his hoodie. “Everywhere I look online, people are screaming about new math and Common Core. I sit next to him every night trying to help, and I don’t get what you’re even teaching him. Is this just new math that’s going to mess him up, or what?”
I pulled the worksheet toward me. The problem in question was 345 + 128. Jax’s work was broken into four neat lines: 300 + 100 = 400, 40 + 20 = 60, 5 + 8 = 13, 400 + 60 + 13 = 473. Mia pointed at the page. “I learned to stack these. Carry the one. Why can’t he just do that? This looks like more work for no reason.”
I told her I get it. I’ve been teaching 4th grade for 12 years, I grew up on the stacked carry method, and when I first started teaching these broken-apart methods, I thought it was a bunch of nonsense too. I even ranted about it to my husband over dinner the first year Common Core standards rolled out in our state. He’s an engineer, and he just blinked at me and said, “Wait, let me add 345 + 128 in my head. What do you think I do? I don’t stack it in my brain. I break it into hundreds, tens, ones. That’s how you do it fast.” That stopped me short. He’d been doing “new math” his whole adult life without even realizing it.
I started with the most common point of confusion: Common Core isn’t “new math.” It’s also not a curriculum. It’s just a list of what kids should be able to do by each grade. The Common Core standard for 4th grade addition just says kids can add multi-digit numbers correctly. It doesn’t say they have to do it this broken-down way, or the stacked way, or any other specific way. What people call “new math” is just the shift to teaching number sense first, before jumping into memorized steps. That’s it.
When I first started teaching, I only taught the stacked method. What I saw year after year was kids who could do the steps just fine when we were practicing that week, but by the next month, half of them would forget when to carry, or mix up the order, and they had no idea their answer was wrong. They’d get 363 for this problem and not even blink, because they didn’t stop to think that 300 something plus 100 something should be around 470, not 300 something. That’s the whole point: when kids learn to break numbers apart by place value first, they understand what each digit actually means. Jax doesn’t just follow rules—he knows the 3 in 345 is 3 hundreds, so adding it to the 1 hundred in 128 makes 4 hundreds. That makes sense to him, it’s not just a trick he memorized for a test.
I flipped Jax’s worksheet over to show Mia his last quiz. Half the problems he did with the stacked method, half with breaking apart. He got all of them right. “We don’t ban the old method,” I said. “We just teach multiple ways so kids can pick what works for them, and so they understand why the method works instead of just memorizing it.”
I told her what I tell all parents who ask this question, three small things that make homework time way easier for everyone. First, don’t start by telling your kid their method is wrong. If it looks weird to you, just say “can you show me how you did that?” Nine times out of ten, they’ll explain it, and it will make sense, and explaining it helps them remember it better anyway. Second, if you still don’t get it, you don’t have to be their teacher. Most elementary schools post a 1-minute example video of each method on their class website, or you can pull up a quick Khan Academy video in 30 seconds. You don’t have to become an expert, you just need to point them to the example if they get stuck. Third, if your kid prefers the method you learned, that’s fine. The goal isn’t to force everyone to do “new math” — the goal is to get the right answer and understand how you got it.
Mia laughed at that, and Jax even perked up a little. “I told you I know how to do it the stacking way,” he said. “This one’s just faster when I don’t have to write all the carrying.” Mia rolled her eyes, but she was smiling. She said all the rants on her mom group Facebook page made her think there was some big conspiracy to mess up how kids do math. I told her I get that, online noise makes everything sound way more dramatic than it is.
I still get this question at least once a week, between parent-teacher conferences and after-school drop-ins. Some parents leave relieved, some still think it’s unnecessary extra work, and that’s okay. It’s not a perfect system—some curricula do force kids to show multiple methods even when they already understand the concept, which is a waste of time, and I tell parents that too. If your kid can get the right answer consistently and explain how they got it, I don’t make them do extra work to show it a different way. At the end of the day, the answer is pretty simple: Common Core is just a list of expectations, and what people call “new math” is just an old idea (teaching understanding before rules) that’s gotten a bad reputation online. It’s not perfect, it’s not for everyone, but it’s not the big confusing mess people make it out to be. Right now, Jax’s homework anxiety has gotten a little better, since Mia stopped trying to force her method and just asks him to explain his. We still check in every Tuesday, but the big question about what we’re actually teaching doesn’t come up anymore.
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