+
Sign up for
The Upworthiest
Our top stories of the day delivered straight to your inbox.
upworthy
Education

Math professor shows how adding and subtracting left to right is actually easier and faster

Mind. Blown.

math tricks
Howie Hua/TikTok

Howie Hua shares helpful math tips and tricks on social media.

Math is weird.

On the one hand, it's consistent—the solutions to basic math problems are the same in every country in the world. On the other hand, there are multiple strategies to get to those solutions, and it seems like people are still coming up with new ones (much to the chagrin of parents whose kids need help with homework using methods they've never learned).

Math professor Howie Hua shares math strategies that make math easier on social media, and his videos are fascinating. Hua, who teaches math to future elementary school teachers at Fresno State, demonstrates all kinds of mental math tricks that feel like magic when you try them.

For instance, Hua has two videos showing how easy and quick it is to add multidigit numbers left to right instead of right to left, and it's genuinely mind-blowing.


Check out how he explains why adding left to right is "underrated."

OK, seriously. That is way easier to do in your head. It's basically putting the numbers into expanded form and adding them, which makes it easier to visualize.

Adding this way makes sense, but subtracting is a bit more complicated, right?

Wrong, apparently. Watch Hua work his math sorcery subtracting two and three-digit numbers.

@howie_hua

Did you know you can subtract left to right? #math #mathematics #mathtok #maths #teachersoftiktok #teacher #mathtricks #mathtrick

Holy moly. That's faster than the right-to-left, borrow-from-the-next-column method, isn't it? And again, so much easier to visualize what's actually happening, though I don't know if I could fully do this in my head like I could with the left-to-right addition.

Hua recently shared another cool subtraction trick for problems with minuends that have a lot of zeroes. (The minuend is the first number in a subtraction problem. Don't be too impressed. I had to look it up.)

Check this out:

@howie_hua

An underrated subtraction strategy #math #mathematics #mathtok #maths #teachersoftiktok #teacher #mathtricks #mathtrick

So simple, so time-saving and so something I would never have figured out on my own.

These tips and tricks might come in handy for anyone, but they're especially useful for kids who are having to do these kinds of math problems at school all the time. Even if they're supposed to solve the problem with a different strategy, these methods can be a quick way to check their answers.

Anything that makes math easier, I say. You can watch Hua's videos on TikTok, YouTube and Twitter.


This article originally appeared on 10.12.22

From Your Site Articles
Internet

Woman explains what dry cleaning actually is and people are legitimately shocked

“They really take the buttons off of every shirt?”

Melissa Pateras TikTok screenshots

Melissa Pateras explains how dry cleaning works.

Have you ever wondered what happens at the dry cleaners? Or are you like me, who just assumed the people at the dry cleaners were wizards and never questioned their magic? Turns out, dry cleaners aren't magic and there's actually a pretty interesting explanation of how they came to be and what they do.

Melissa Pateras is known on Tiktok for her laundry knowledge. Seriously, her ability to fold laundry is hypnotizing. This time, she created a video explaining what actually takes place at the dry cleaner and the internet is aghast.

Before Pateras explained what happens in the mysterious world behind the counter of a dry cleaner, she asked a few of her friends what they thought dry cleaning was. Their answers were...interesting to say the least.

One friend surmised, "You put it in a box, right...and then you let some wind, really fast wind, blow around on your clothes and it wipes off all the dirt." The friend, whose username is @unlearn16, continued with her working hypothesis, saying that the clothes are then blasted with infrared heat to sterilize the garments. While that is certainly an interesting theory, that's not what happens.

Keep ReadingShow less
dry cleaning explained
Pop Culture

Miranda Lambert calling out selfie taking fans, sparks debate about concert etiquette.

Is it a form of disrespect?

en.wikipedia.org

Was she in the right?

Country singer Miranda Lambert recently paused mid-song during a show in Las Vegas to confront fans who were taking a selfie during the performance, and no one can seem to agree whether or not she was right to do so.

In a video taken at the Sunday night concert, Lambert is seen beginning her ballad “Tin Man” when she suddenly says, "I'm gonna stop right here for a second, I'm sorry. These girls are worried about their selfie and not listening to the song,” referencing a group of friends somewhere in the front section.

“I don’t like it, at all,” she continues, “We’re here to hear some country music tonight…I’m singing some country damn music,” before motioning for them to put their phones away.

Keep ReadingShow less
Family

Man's reaction to hearing his stepdaughter call him 'Dad' is an emotional masterpiece

"You just made my day the happiest ever."

Shane and Liana|YouTube

Man hears stepdaughter call him "Dad" for the first time.

Being a parent is often a thankless job, and being a stepparent is usually even more thankless. But most parents show up and do their best to make sure their kids have what they need and feel loved. So when our kids do or say something to show appreciation, it melts our hearts—but nothing melts it faster than a stepchild calling their bonus parent "Mom" or "Dad" for the first time.

A creator named Shane posted a clip from a longer video showing his reaction to hearing his stepdaughter call him "Dad" for the first time. The full video is about three years old, but when it was reposted as a clip recently, it pulled on everyone's heartstrings.

Shane and his wife, Liana, run the social media pages Shane and Liana where they post silly videos pranking each other. But this video wasn't a prank. His stepdaughter, London, wanted to surprise him after wanting to call him "Dad" for a long time.

Keep ReadingShow less
stepparenting
Joy

Dog refuses to walk with her mom, but miraculously, her legs 'work with Grandma'

She doesn't care if her mom knows it.

The Dodo|Facebook

Dog refuses to walk with Mom, but her legs work with Grandma.

What gives dogs the right to have such big and hilarious personalities? It seems like these dogs have found a way to make their humans laugh while also annoying them until they're ready to come apart. It's truly a skill that only dogs and toddlers seem to possess in great quantities.

Zoe is a pit bull with a bombastic side-eye that makes it clear that she only tolerates her mother, Raven, but adores her grandmother, Yonika. There is no confusion about who her favorite person is, and Zoe's grandmother only seems to encourage the behavior. The two of them are the best of friends, and Mom...well, she's the third wheel.

Sure, Zoe likes her mom a little—she does feed her, after all—but the verdict is still being determined if love can be claimed. Raven can't even convince the sassy pittie to go on a walk with her.

Keep ReadingShow less
funny dog videos
Pop Culture

Guy shows off unreal drumming skills during mesmerizing 'AGT' audition

The rhythm, the energy, the smile. No wonder one judge called it "the perfect audition."

America's Got Talent/Youtube

Gotta love a good drum solo.

Few instruments in this world are as universally loved as the drums. For thousands of years, humans in virtually every culture have used drums to raise energy, be it for ceremonial purposes or good old-fashioned celebration. I mean, have you ever listened to a really bangin’ drum solo and not been immediately revved up? It’s pretty much impossible.

So when a masterful drum player aces an instrument that already gives such a visceral experience, you know you’re in for one hell of an auditory ride. Twenty-six-year-old Timothy Fletcher gave “America’s Got Talent” audiences just that.

Keep ReadingShow less
music
Joy

Home invasion robber returns cash to victim after running into him at a video poker lounge

Talk about a bizarre reunion.

via Michael Coghlan/Flickr and Trap Gang/Pexels

A robber and his victim have a bizarre reunion.

An unusual story out of Australia shows that even though someone may be a hardened criminal, they may still have feelings of remorse. It also shows that even their victims can forgive and forget if they don’t take things too personally.

The Daily Mail reports that Christopher Howard Gordon, 35, knocked on the door of a home in the Victorian town of Traralgon in Australia last March, holding a fake gun. When a man opened the door, Gordon demanded that he be allowed in the home and that the owner give him cash.

The man led him into a room where his daughter and partner slept. After seeing the sleeping child, Gordon was startled and immediately fled the home after receiving a box of cash.

Keep ReadingShow less
crime
Trending Stories