Subtracting Three Numbers | How to Subtract | Khan Academy Kids

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In this lesson, we explored subtraction through a playful scenario involving bath toys. By starting with 10 toys and subtracting the number placed in the water by both you and your friend, we demonstrated how to calculate the remaining toys, reinforcing the concept of subtraction as taking away from a total. This engaging activity highlights the practical application of subtraction in everyday situations.
  1. How many bath toys did you start with?
  2. If you put 2 toys in the water, how many toys do you have left?
  3. What happens to the number of toys when you and your friend both put toys in the water?

Understanding Subtraction Through Bath Toys

Playing with bath toys can be a fun and educational experience. In this activity, we explore the concept of subtraction using a simple scenario involving bath toys. Let’s dive into how this works!

The Scenario

Imagine you have a collection of 10 bath toys. You and your friend decide to play with them in the water. You both want to put some toys in the water, but you also want to know how many will be left after doing so.

Step-by-Step Subtraction

Initially, you have 10 bath toys. You decide to put 2 toys in the water. To find out how many toys remain, you perform the subtraction:

10 – 2 = 8

Now, your friend also wants to put 2 toys in the water. Again, you need to subtract to see how many toys are left:

8 – 2 = 6

So, after both of you have placed your toys in the water, you are left with 6 bath toys.

The Core Concept

The main concept here is subtraction, which is a fundamental mathematical operation. It involves taking away a certain number from a larger group to find out what remains. In this example, we used subtraction twice to determine how many bath toys were left after each of you placed some in the water.

Conclusion

By using bath toys, we learned how to apply subtraction in a practical and enjoyable way. This simple exercise helps reinforce the understanding of subtraction as taking away from a total, which is a valuable skill in everyday life.

  • Can you think of a time when you had to share something with a friend or family member? How did you decide how much each person would get, and did you use subtraction to figure it out?
  • Imagine you have a different number of toys, like 15 or 20. How would you use subtraction to find out how many toys are left if you and a friend put some in the water? Can you come up with your own subtraction story?
  • Why do you think subtraction is an important skill to learn? Can you think of other situations in your daily life where you might use subtraction?
  1. Subtraction Treasure Hunt: Gather a collection of small toys or objects at home. Start with a total of 10 items. Ask a family member to hide some of them while you close your eyes. Once they are hidden, open your eyes and count how many are left. Use subtraction to figure out how many were hidden. For example, if you started with 10 and now see 7, calculate 10 – 7 to find out 3 were hidden. Repeat with different numbers to practice subtraction!

  2. Subtraction Story Time: Create a short story using your bath toys or any other toys you have. For example, “Once upon a time, there were 10 rubber ducks swimming in the tub. Two ducks decided to go on an adventure and left the tub. How many ducks are still swimming?” Act out the story with your toys and solve the subtraction problem. Encourage your child to come up with their own stories and subtraction problems.

  3. Everyday Subtraction Observations: Throughout the day, look for opportunities to use subtraction in real life. For example, if you have 5 apples and eat 2, ask your child how many are left. Encourage them to notice and solve subtraction problems during meals, playtime, or while shopping. This helps them see the practical use of subtraction in everyday situations.

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