Two tens plus five tens, you're going to have seven tens. And then, finally, if you have three hundreds and you add two more hundreds, how many hundreds are you going to have?

Practice adding 3 numbers. All numbers in these problems are 20 or less.

We have three different addition problems right over here. And what I want you to do so you get the hang of things is to pause the video and try them on your own.

Let's explore adding two 3-digit numbers using place value and carrying. We walk through the process step by step, starting with the ones place, then the tens place, and finally the …

Now, if I saw something like 355 plus 480, if you have some paper around, you could write these numbers down and do your traditional addition, but you might want to be able to do these in …

In this topic, we will add and subtract whole numbers. The topic starts with 1+1=2 and goes through adding and subtracting within 1000. We will cover regrouping, borrowing, and word …

By following this method, you can accurately add decimals and solve real-world problems. Created by Sal Khan and Monterey Institute for Technology and Education.

Practice adding numbers like 554 and 237 using a number line. All numbers are less than 1000.

We have three different addition problems right over here. And what I want you to do so you get the hang of things is to pause the video and try them on your own.

But if you are adding three or more numbers, the digits you add together can add up to more than 18, in which case, you might have to carry two, three, or more.