Lesson Video: Column Addition of Three-Digit Numbers: No Regrouping Mathematics • 2nd Grade

In this video, we will learn how to add two three-digit numbers when we do not have to regroup and record the calculation in columns.

06:48

Video Transcript

Column Addition of Three-Digit Numbers with No Regrouping

In this video, we will learn how to add two three-digit numbers using column addition. When we’re adding together two three-digit numbers, we need to think about the value of the digits. When we add using column addition, we always start in the ones place or the ones column. We have five ones plus two ones. What’s the total number of ones? What is five plus two? Five plus two is seven. Now we need to add the tens. 215 has one ten, and the number 142 has four tens. How many tens are there altogether? What is one plus four? One ten plus four tens gives us a total of five tens.

Now, we just need to add the hundreds. 215 has two hundreds. 142 has one hundred. Two hundreds plus one hundred gives us a total of three hundreds. When we’re adding two three-digit numbers, first, we add in the ones column. Then we add in the tens column. And then we add the hundreds. 215 plus 142 equals 357. Let’s try some questions now to help us practice adding using column addition.

Add three to 345. Hint: Use the place-value blocks if you need to.

We have to add three to 345. We’re going to use column addition, and we’re going to use the place value blocks to help. The number 345 is a three-digit number. It has five ones, four tens, and three hundreds. The number that we’re adding is a one-digit number. It only has a ones digit, so we just need to add in the ones column. We have five ones, and we need to add three more. Five plus three is eight. There’s nothing to add to the four tens in 345, so the total number of tens is four. And there’s nothing to add to our three hundreds, which means the total number of hundreds is three. 345 plus three equals 348.

Add 40 to 251. Use the place value blocks if you need to.

In this question, we need to use column addition to add 251 and 40. Did you notice that we’ve written the largest number first, 251? When we’re adding using column addition, we need to start in the ones column. The number 251 has one one, and the number 40 has no ones. One plus zero gives us a total of one. Next, we need to move to the tens column. 251 has five tens, and 40 has four tens. What is five plus four? It’s nine. Finally, we just need to add in the hundreds place. There are two hundreds in the number 251, but the number 40 has no hundreds, so there’s nothing to add to our two hundreds. The total is two. 251 plus 40 gives us a total of 291. First, we added the ones, then the tens, then the hundreds. 251 plus 40 is 291.

Add 200 to 372. Use the place value blocks if you need to.

When we’re adding using column addition, we always start in the ones column. 372 has two ones, and 200 has none. So we need to add together two and zero, which gives us a total of two ones. 372 has seven tens, but 200 has none. There’s nothing to add to our seven tens. The total number of tens is seven. Now we just need to add in the hundreds column. 372 has three hundreds, and 200 has two hundreds. We need to add together three hundreds and two hundreds. We know that three plus two is five. 372 plus 200 is 572. Did you notice that what we had to do was add in the hundreds column?

Add 326 to 241. Use the place value blocks if you need to.

In this question, we need to add together two three-digit numbers. We need to start in the ones column. 326 has six ones. 241 has one one. Six plus one gives us a total of seven ones. Two tens plus four tens is six tens. And three hundreds plus two hundreds gives us a total of five hundreds. 326 plus 241 equals 567. We added these two three-digit numbers using column addition.

What have we learned in this video? We’ve learned how to add two three-digit numbers using column addition. We’ve learned that, first, we add the ones, then the tens, and then the hundreds.

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