yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

Adding 3-digit numbers (no regrouping) | 2nd grade | Khan Academy


2m read
·Nov 11, 2024

  • [Voiceover] So I have two numbers here that I wanna add together. The first number is 327, and that means three hundreds. I have a three in the hundreds place. You see them right over here. You see the three hundreds, each of these big squares have a hundred little squares in 'em, so three of them is going to be three hundreds.

And then I have two tens. Two tens, the two is in the tens place, so this is the two tens right over here. And then I have seven ones. The seven is in the ones place. Seven is in the ones place, and you see the seven ones. Seven ones, right over there.

Now, this is three hundreds, two tens, and seven ones, or 327. Now, to that, I wanna add 251, or another way of thinking about it as I wanna add two hundreds, because the two is in the hundreds place, two hundreds. Two hundreds. One hundred, two hundred.

Fifty is the same thing as five tens; we see a five in the tens place. Five, let me do that same color. Five tens, right over here. One ten, two tens, three tens, four tens, five tens. And then finally, I have a one in the ones place, so that just means one one. You see that right over there. This is one. One one.

Now, pause the video, and see if you could add these two numbers together. All right, now let's do it together. So we have seven ones, and to that we're going to add one one, so how many ones is that going to be? Well, seven ones plus one one is going to be eight ones. You see here, seven, and then you have an eighth one. So eight ones, seven plus one is eight.

Now let's look at the tens. I had two tens, and I'm gonna add five more tens. You put 'em all together, you're going to have seven tens. Two tens plus five tens, you're going to have seven tens.

And then, finally, if you have three hundreds and you add two more hundreds, how many hundreds are you going to have? Well, you're going to have five hundreds. You see these five groups of a hundred right over here. So you're gonna put a five in the hundreds place.

So 327 plus 251 is 578. Five hundreds, seven tens, and eight ones.

More Articles

View All
TIL: How to Transform Mars into Our Second Home | Today I Learned
Hey there, would you like to live on Mars? That’s a garbage idea! If you try to go out there right now, you would simultaneously freeze and choke to death. I’m Brendan Mullin, an emerging explorer with National Geographic and an astrobiologist. I’m here …
Balaji Srinivasan at Startup School 2013
I can talk about white combinator. I guess you guys all know about that. Uh, let me introduce myself briefly while, uh, things are loading here. So, uh, my name is Bology S. Boson. Um, there’s actually 12 people with my same first and last name in the Bay…
Nietzsche - Overcome Shame, Become Who You Are
In The Joyous Science, Nietzsche writes, “Whom do you call bad? Those who always want to put others to shame. What is most humane? To spare someone shame. What is the seal of liberation? To no longer be ashamed of oneself.” So according to Nietzsche, some…
Abstinence-Only Sex Ed | Original Sin: Sex
By the 1990s in the U.S., most of the advances to public sex education made since the 50s are political roadkill. Late 90s, there is this increase in abstinence-only sex education. In 1993, the Southern Baptists asked American teens to put a ring on it a…
RECESSION ALERT: The FED Just Crashed The Stock Market
Welp, I thought this is going to be a normal day. As I woke up, opened my computer, took a sip of coffee, expected to get more recommendations on Johnny Depp’s trial, and was immediately hit by the headline: GDP fell by 1.4 percent, leading to the concern…
Ray Dalio: Are we in a Stock Market Bubble?
So Ray Dalio is back on YouTube and his most recent video is actually a really cool 10 minute explainer on whether we’re currently in a stock market bubble. Now Ray is obviously the founder of Bridgewater Associates, the most successful hedge fund the wor…