Multiplying 3-digit by 2-digit numbers | Grade 5 (TX TEKS) | Khan Academy

2m read

·Nov 10, 2024

Let's get a little bit of practice multiplying numbers. So, what is 365 times 84? I encourage you to pause this video; hopefully, you have some scratch paper around, and try to calculate what this is.

All right, now let's do this together. What I like to do is, let me first write 365, and then let me write 84 right under that. But make sure that I line up the place values. So I put the eight in the tens place right under that six, and the four in the ones place right under that five.

Now I am ready to multiply. The first thing I'm going to do is I'm going to multiply 365 by 4. So, 4 times 5 is 20; I'll put the zero in the ones place, and I'll regroup that two because it's really 2 tens. So, 4 times 6 is 24 plus that two; we're really talking about 24 tens. So, plus another two tens is going to be 26 tens. I'll put six tens right over here, and then I'll regroup the two up here.

Now I have 4 times 3; it's really 4 times 300. But 4 times 3 is 12 plus those two that I just regrouped is 14. So, let me put the 14 hundreds here. Now, let me worry about this eight. Well, this eight is in the tens place; it's really 80. So, let me just put a zero here.

I start in the tens place, and let me get rid of these characters right over here so I don't confuse myself. So, 8 times 5 is 40; I'll put the zero right over here and regroup the four. 8 times 6 is 48, and then I add that four; it's going to get me to 52. Then, 8 times 3 is 24 plus 5 is going to be 29.

Now I can add everything together: 0 plus 0 is 0; 6 plus 0 is 6; 4 plus 2 is 6; 1 plus 9 is 10; put the zero here and regroup the one. 1 plus 2 is 3, and I'm done. I got 3,660.

Node voltage method (step 5) | Circuit analysis | Electrical engineering | Khan Academy

This Platform Might Be Worse Than TikTok

View All

Transformations, part 3 | Multivariable calculus | Khan Academy

So I want to give you guys just one more example of a transformation before we move on to the actual calculus of multivariable calculus. In the video on parametric surfaces, I gave you guys this function here. It’s a very complicated looking function; it’…

Types of price discrimination

We have already introduced ourselves to the idea of price discrimination in other videos, and in this video, we’re going to try to classify the different ways that a firm might engage in price discrimination. So first of all, just as a review of what it …

Explorer Albert Lin explores a cave burial site filled with ancient carvings

So little is known about the Picts. Searching for their lost kingdom means I must follow every lead, and there’s something on the walls of this cave that’s drawing me in. I’m going to start the scan. Okay, yeah, my handheld Light Art technology allows me…

15 Problems Only WEAK PEOPLE Care About

When you know your worth, you’re likely to take steps that reflect your confidence. But if you’re mentally weak, you’ll end up showing a few traits that will never let you become successful. The act of living offers a variety of difficulties and barriers.…

Can Money Buy Happiness? Yes, According to Philosophy & Science

Some people claim that money is the root of all evil, pointing at the enormous amounts of violence humanity imposes on itself motivated by acquiring it. Others argue that not money but the lack of money is the root of evil, as people, out of fear of being…

If You Were a Tree... - Fan Questions | StarTalk

I’d want to be planted in a wide-open meadow so that every one of my branches can receive all the sunlight at once. I don’t want to have to compete for the photons from the Sun, which is what goes on daily, hourly, in a forest, especially rainforests wher…

Multiplying 3-digit by 2-digit numbers | Grade 5 (TX TEKS) | Khan Academy

More Articles