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.
