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

Subtracting two-digit numbers without regrouping (example 2) | 2nd grade | Khan Academy


2m read
·Nov 11, 2024

  • I would like you to pause the video and think about what 64 minus 31 is. Alright, now let's think about this together. So what does 64 actually mean?

Well, we can use place value to think about that. The six is in the tens place and the four is in the ones place. So the six over here, that means six tens. It means six groups of ten. And so, we can visualize that right over here. Six tens: one, two, three, four, five, six groups of ten. Or another way to think about it, six tens, these are 60 boxes right over here in groups of ten.

And then we have four ones. Well, this is four ones right over here. Four ones. So this is 64. Six tens, four ones. Altogether, I have 64 boxes. Sixty of these blue ones and I have four ones. Four of these individual ones. Now I want to take away 31.

Well, what is 31? Thirty-one is three tens and one one. So let's first take away the one one. We're going to take this away; we're subtracting. We're subtracting three tens and we're subtracting one one. So let's take away that one one. And then how many ones are we left with?

Well, now we're left with three ones. So four ones minus one one is three ones. Now let's think about the tens. So I had six tens. I'm going to take away three of them. I'm going to take away three of the tens. So let's do that. Let's take away: that's one ten, two tens, and then three tens.

And so, what am I going to have left over? Well, I'm going to have left over just three tens. Just these three, these three right over here. So six tens minus three tens is three tens. And so, 64 minus 31 is 33. Three tens and three ones. Three tens: this is a group of ten, another group of ten, another group of ten. Three tens and then three ones. One, two, three.

More Articles

View All
Evolution of group behavior | Mechanisms of evolution | High school biology | Khan Academy
In our journey studying evolution and natural selection, we often index on individual organisms. If we look at a species or population of a certain species, we’ve talked about how there could be variation in that population, which I will depict by these c…
The Next Housing Market Crash (Worse Than 2008)
What’s up, Graham? It’s Guys here, and 2023 is already shaping up to be an absolute mess. Thieves have reportedly stolen 2 million dimes from the back of a van in Philadelphia. A teenager was banned for climbing into and getting stuck in a claw machine. H…
Creativity break: What can we do to expand our creative skills? | Algebra 1 | Khan Academy
There are so many ways that you can expand your creative and math skills without even really realizing that you’re doing it. Like for me, I’m a big board game fan. Um, I realize that there are so many games that involve math and learning how to solve pro…
Sources of income during retirement | Investments and retirement | Financial literacy | Khan Academy
Let’s talk a little bit about sources of income during retirement. So, we’re assuming you’re retired, you’re not working, so you’re not going to get that income. But one of them is perhaps just your straight-up investment income. You save money over time…
Startup Advisor Equity? - Pebble Watch Founder Eric Migicovsky
Bringing on advisors or creating a network of people who can help you is critical for an early stage founder, especially a first-time founder. I did it myself; I had ups and downs in the process, but that’s just like every other part of building a startup…
Naive Optimism Will Change Your Life
Imagine you’re an Olympic athlete; you could be a track star, a distant swimmer, or a figure skater. Whatever sport you choose, chances are you’ve been training for it since the moment you could walk. You have your gym routine down to a science. You’ve hi…