Adding with Objects | How to Add | Khan Academy Kids

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In this lesson, we explore a fun story about Alo and Cody, who combine their toy dinosaurs to find out how many Cody has. By solving a simple addition problem, we determine that if Alo has two dinosaurs and together they have five, then Cody must have three toy dinosaurs. This lesson highlights how math can be enjoyable and useful in solving everyday puzzles.
  1. How many toy dinosaurs does Alo have?
  2. If Alo has two dinosaurs and they have five together, how many does Cody have?
  3. What do you think is fun about using math to solve problems?

How Many Dinosaurs Does Cody Have?

Let’s dive into a fun story about toy dinosaurs! Alo has two toy dinosaurs. He decides to put his toys with Cody’s toys. Together, they have a total of five toy dinosaurs. So, how many dinosaurs does Cody have?

Solving the Mystery

To find out how many dinosaurs Cody has, we can do a simple math problem. If we add Alo’s two dinosaurs to Cody’s dinosaurs, we get five in total. So, we need to figure out what number, when added to two, equals five.

If we add two and three, we get five. This means Cody has three toy dinosaurs!

The Answer

So, the answer to our fun little puzzle is that Cody has three toy dinosaurs. Isn’t math fun when we use it to solve mysteries?

  • Can you think of a time when you shared your toys with a friend? How did it feel to play together with more toys?
  • If you had five toy dinosaurs and gave two to a friend, how many would you have left? What other things can you share with friends to make playing more fun?
  • Why do you think it’s important to work together to solve problems, like figuring out how many dinosaurs Cody has? Can you think of a problem you solved with someone else?
  1. Dinosaur Counting Game: Gather some small objects like buttons or coins to represent toy dinosaurs. Ask the children to create different groups of objects to represent Alo’s and Cody’s dinosaurs. For example, start with two objects for Alo and ask them to add more objects until they reach a total of five. How many did they add? Encourage them to try different numbers and see how the total changes.

  2. Draw and Share: Provide paper and crayons for the children to draw a picture of Alo and Cody with their toy dinosaurs. Ask them to draw two dinosaurs for Alo and three for Cody. Once they finish, have them share their drawings with the class and explain how they figured out the number of dinosaurs Cody has.

  3. Real-Life Math Detective: Encourage the children to be math detectives at home. Ask them to find a group of objects, like fruit or toys, and create a similar puzzle. For example, if they have a total of seven apples and they know they have three red apples, how many green apples do they have? Have them share their puzzles with family members or friends and solve them together.

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