Adding 10 | Place Value for Kids | Khan Academy Kids

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In this lesson, we explored the concept of addition using blocks as a visual aid. By starting with 30 blocks and adding 10 more, we learned to break down the numbers into groups of tens, ultimately discovering that 30 plus 10 equals 40. This approach not only simplifies the addition process but also enhances our understanding of the 10’s place in numbers.
  1. How many blocks do you have if you start with 30 and add 10 more?
  2. What does the 10’s place tell us about the numbers 30 and 10?
  3. Can you explain how we added the groups of 10 together to find the total?

Understanding Addition with Blocks

Hey there! Today, we’re going to learn about adding numbers using blocks. It’s a fun and simple way to understand addition. Let’s dive in!

Adding Blocks Together

Imagine you have 30 blocks. Now, you want to add 10 more blocks to your collection. How do we figure out how many blocks you have in total?

Let’s break it down:

  • You start with 30 blocks.
  • You add 10 more blocks to the pile.

Understanding the 10’s Place

When we talk about numbers like 30 and 10, we often look at the 10’s place. The 10’s place tells us how many groups of 10 are in the number.

In 30, there are three groups of 10. In 10, there is one group of 10.

Adding the Groups of 10

Now, let’s add the groups of 10 together:

  • 30 has three groups of 10.
  • 10 has one group of 10.

When you add them, you get four groups of 10. So, 30 + 10 equals 40!

The Result

By adding the blocks, we learned that 30 plus 10 equals 40. It’s that simple! Now you know how to add numbers using blocks and understand the 10’s place better.

Keep practicing, and you’ll become a pro at addition in no time!

  • Can you think of a time when you used blocks or toys to count or add things together? How did it help you understand the numbers better?
  • If you had 20 blocks and your friend gave you 15 more, how would you figure out how many blocks you have now? Can you explain your thinking?
  • Why do you think it’s important to understand the 10’s place when adding numbers? How does it make adding easier or more fun?
  1. Block Building Challenge: Gather some building blocks or any small objects you can stack. Start with a pile of 30 blocks. Ask a friend or family member to give you 10 more blocks. Count them together to see how many you have now. Can you make different shapes or structures with your 40 blocks? Try building a tower or a house and see how tall or wide you can make it!

  2. Number Hunt: Go on a number hunt around your house or classroom. Look for items that come in groups of 10, like a pack of crayons or a set of markers. Count how many groups of 10 you can find. Add them up to see how many items you have in total. Can you find more than four groups of 10?

  3. Draw and Color: Draw a picture of 30 blocks on a piece of paper. Then, draw 10 more blocks next to them. Color each group of 10 blocks in a different color. How many different colors did you use? Write the numbers 30 and 10 next to your drawing and practice adding them together. Can you think of other numbers you can add using this method?

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