Use Expanded Form to Add 2-Digit Numbers | Place Value for Kids | Khan Academy Kids

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In this lesson, students learn a fun and simple method for adding two numbers by breaking them down into tens and ones. Using the example of adding 26 and 31, they first add the ones (6 + 1 = 7) and then the tens (20 + 30 = 50), ultimately combining these results to find the total sum of 57. This step-by-step approach helps make addition more accessible and enjoyable.
  1. What are the two parts we can break the numbers into when we add them?
  2. How do we find the total when we add the ones together?
  3. What do we get when we add the tens and the ones together at the end?

Learning Addition: A Fun Way to Add Numbers

Hey there! Today, we’re going to learn how to add two numbers together in a fun and easy way. Let’s take a look at how we can add 26 and 31 using a simple method.

Breaking Down the Numbers

First, let’s break down the numbers into tens and ones. This will make it easier to add them together.

  • The number 26 has two tens and six ones. So, we can think of it as 20 (two tens) and 6 (six ones).
  • The number 31 has three tens and one one. So, we can think of it as 30 (three tens) and 1 (one one).

Adding the Ones

Now that we’ve broken down the numbers, let’s start by adding the ones. We have 6 ones from 26 and 1 one from 31. When we add them together, 6 + 1 equals 7. So, we have seven ones.

Adding the Tens

Next, let’s add the tens. We have 20 from 26 and 30 from 31. When we add these together, 20 + 30 equals 50. So, we have fifty from the tens.

Finding the Final Sum

Finally, we combine the tens and ones to find the total sum. We have 50 from the tens and 7 from the ones. When we add them together, 50 + 7 equals 57.

The Answer

So, when we add 26 and 31, the final answer is 57. Isn’t that a fun and easy way to add numbers?

Now you know how to break down numbers and add them step by step. Keep practicing, and you’ll become a math whiz in no time!

  • Can you think of a time when you used addition in your daily life? Maybe when you were counting toys or adding up scores in a game?
  • Imagine you have 15 candies and your friend gives you 10 more. How would you use the method we learned to find out how many candies you have in total?
  • Why do you think breaking down numbers into tens and ones makes it easier to add them? Can you try breaking down the number 42 and 23 and add them together?
  1. Number Detective: Find different objects around your home, like toys or books, and count them. Break down the total number into tens and ones. For example, if you have 34 toys, think of it as 30 (three tens) and 4 (four ones). Try this with different numbers and see how quickly you can break them down!

  2. Build a Number Line: Create a number line using a long strip of paper or a ruler. Mark numbers from 0 to 100. Use small objects like buttons or coins to represent numbers. Practice adding numbers by moving the objects along the number line. For example, start at 26 and move 31 spaces forward. What number do you land on?

  3. Story Problems: Create a simple story that involves adding numbers. For example, “You have 26 apples, and your friend gives you 31 more. How many apples do you have now?” Draw pictures to represent the story and solve the problem by breaking down the numbers into tens and ones, just like in the lesson.

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