Subtracting 10-20 | How to Subtract | Khan Academy Kids

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In this lesson, students learn about subtraction through a relatable scenario involving snowballs melting away. By starting with 11 snowballs and discovering that only 8 remain, they practice subtraction to determine that 3 snowballs melted. This engaging example illustrates how subtraction helps us understand changes in quantities in everyday life, encouraging students to apply this concept in various situations.
  1. How many snowballs did you start with, and how many do you have now?
  2. If 3 snowballs melted, how can we find out how many were left?
  3. Can you think of another time when you might use subtraction in your life?

The Magic of Subtraction: Understanding How Numbers Change

Have you ever played in the snow and made snowballs? Imagine you made a bunch of them, but as time passes, some start to melt away. This simple scenario is a fun way to learn about subtraction, a basic math concept that helps us understand how numbers change when we take some away.

Counting Snowballs: A Real-Life Math Problem

Let’s say you started with 11 snowballs. You were so proud of your collection, but then you noticed that some of them began to melt. After a while, you counted again and found that you only had 8 snowballs left. This means some of your snowballs disappeared!

Solving the Mystery: How Many Snowballs Melted?

To figure out how many snowballs melted, you can use subtraction. Start with the number of snowballs you originally had, which is 11. Then, count how many you have now, which is 8. The question is: how many snowballs melted away?

By subtracting the number of snowballs you have now (8) from the number you started with (11), you can find out how many melted. So, 11 minus 8 equals 3. This means 3 snowballs melted.

Understanding Subtraction

Subtraction is like taking away. When you subtract, you find out how many are left after some are removed. In our snowball example, we took away the melted snowballs to see how many were left. This is a simple yet powerful way to understand how subtraction works in everyday life.

Practice Makes Perfect

Now that you know how subtraction works, try using it in other situations. Whether you’re counting toys, candies, or anything else, subtraction can help you keep track of what you have. Remember, math is all around us, and with a little practice, you’ll become a subtraction expert in no time!

  1. Can you think of a time when you had to use subtraction in your daily life, like when you shared your toys or snacks with friends? What happened, and how did you figure out how many were left?
  2. Imagine you have a collection of something special, like stickers or toy cars. If you gave some to a friend, how would you use subtraction to find out how many you have left? Can you share your story with us?
  3. Why do you think it’s important to learn about subtraction? How do you think it helps us in real life, like when we’re playing games or helping at home?
  • Snowball Subtraction Game: Gather some small objects like buttons or coins to represent snowballs. Start with a certain number, like 10, and then take away a few. Ask the children to count how many are left and how many were taken away. Repeat with different numbers to practice subtraction in a fun, hands-on way.

  • Subtraction Story Time: Encourage the children to create their own subtraction stories. They can draw pictures or use toys to act out a scenario where they start with a certain number of items and some are taken away. Ask them to explain how many are left and how they figured it out.

  • Everyday Subtraction Hunt: Challenge the children to find examples of subtraction in their daily lives. They might notice when they eat some of their snacks or when toys are put away. Ask them to share their findings and explain how subtraction was involved in each situation.

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