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.

The History and Future of Everything -- Time

Why Millennials Aren’t Buying Homes

View All

Reduction of Air Pollutants| Atmospheric Pollution| AP Environmental Science| Khan Academy

Hey there friends, today we’re going to learn about air pollution, and to start off, we’re going back in time to the small town of Donora, Pennsylvania, in October of 1948. Walking into this small industrial town, you can immediately sense that something…

5 Good Philosophies To Live By

Pay attention to what we’re about to tell you now because this is really important. There are many ways in which you can experience life, but not all of them will bring the same amount of joy, peace, and fulfillment when the game is finally over. In fact,…

If FACEBOOK was a VIDEO GAME ... (Fake Game Trailer)

[Music] Are you guys bored? Well, check this out! Vsauce Fate Games presents Facebook: The Game. Would you guys like something like that? Well, pop in the cartridge and explore 150 million profiles. Avoid the dangerous, murderous pokes! Do people even do …

Saving Sea Turtles in the Solomon Islands | Short Film Showcase

[Music] [Music] [Music] The first time I came here was in 2001, and it was just like yesterday. The first time I arrived here, I was so, so amazed that nature came so, so close, and so it really touches [Music] me. There are two species of sea turtles …

Warren Buffett & Bill Gates - University of Washington

You ought to be happy where you are working, and I always worry about people who say, “You know, I’m going to do this for 10 years. I really don’t like it very well, and then I’ll do 10 more years of this.” I mean, that’s a little like saving up sex for y…

How Old Is The Earth?

I’m in New Zealand’s beautiful Milford Sound, which is actually not a sound but a fjord. So one question you might ask is, what is a fjord? Well, the answer is it’s a giant channel carved out of the rock, and it was carved by glaciers—so ice moving down t…

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

More Articles