Counting On | How to Subtract | Khan Academy Kids

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In this lesson, students learn the concept of counting backwards through a fun example involving strawberries. By starting with nine strawberries and counting backwards after eating six, they discover that three strawberries remain, illustrating how this technique can simplify subtraction and make math more engaging in everyday scenarios.
  1. How many strawberries did you start with before you began eating?
  2. What happens when you count backwards from nine after eating some strawberries?
  3. Can you think of another fun way to use counting backwards with your favorite snack?

Discovering the Magic of Counting Backwards with Strawberries

Have you ever wondered how counting backwards can help solve simple math problems? Let’s explore this concept using a fun example involving strawberries, a delicious snack that many of us love!

The Strawberry Snack Dilemma

Imagine it’s snack time, and you’re excited to enjoy some juicy strawberries. You start with nine strawberries, but after a while, you eat six of them. Now, the question is, how many strawberries do you have left?

Using Backward Counting to Solve the Problem

To find out how many strawberries remain, we can use the method of counting backwards. This technique is not only useful but also a fun way to practice subtraction. Let’s count backwards from nine to see how many strawberries are left:

  • Start at 9
  • Count backwards: 8, 7, 6, 5, 4, 3

As you count backwards, you realize that you have reached the number three. This means there are three strawberries left after eating six.

The Joy of Learning with Everyday Examples

Counting backwards is a valuable skill that can help you solve various math problems in everyday life. By using simple examples like strawberries, you can make learning math both engaging and enjoyable. So next time you have a snack, try using backward counting to see how it can help you with math!

  • Have you ever tried counting backwards with something fun, like your toys or snacks? How did it help you figure out how many were left?
  • Can you think of other times when counting backwards might be useful, like during a game or when waiting for something exciting to happen?
  • What is your favorite snack, and how would you use counting backwards to find out how many pieces you have left after sharing with a friend?
  1. Strawberry Counting Game: Gather a small group of objects, like toy blocks or buttons, to represent strawberries. Start with a set number, such as 10, and practice counting backwards as you “eat” or remove each one. Encourage your child to say each number out loud as they remove an object. This hands-on activity helps reinforce the concept of counting backwards in a fun and interactive way.

  2. Backwards Number Line Hop: Create a number line on the floor using tape or chalk, numbering it from 0 to 10. Have your child start at a higher number, like 9, and hop backwards to a lower number, such as 3, while counting each step. This physical activity helps children visualize and understand the concept of counting backwards as they move along the number line.

  3. Everyday Backward Counting: Encourage your child to use backward counting in daily activities. For example, when waiting for a timer to finish, count backwards from 10 to 0. Ask questions like, “If we have 5 minutes left and 2 minutes pass, how many minutes are left?” This practice helps children apply backward counting in real-life situations, enhancing their problem-solving skills.

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