Multiply by 9 | Learn Multiplication | Multiply By Music

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In this lesson, students explore the number 9 and learn a fun and effective method for multiplying by it. They practice multiplication facts from 9 x 1 to 9 x 12, and discover a neat trick: to multiply a number by 9, they can add a zero to that number and then subtract the original number to find the answer. The lesson encourages practice and reinforces the idea that learning math can be enjoyable.
  1. What is the trick you can use to help you multiply by 9?
  2. Can you list some of the answers for multiplying by 9 that you learned?
  3. How does practicing multiplication make you feel about math?

Let’s Have Fun with the Number 9!

Hey there! Are you ready to learn something cool about the number 9? Let’s dive in and have some fun with multiplication!

Multiplying by 9

When we multiply by 9, we can use a simple trick to make it easier. First, let’s look at some examples:

  • 9 x 1 is 9
  • 9 x 2 is 18
  • 9 x 3 is 27
  • 9 x 4 is 36
  • 9 x 5 is 45
  • 9 x 6 is 54
  • 9 x 7 is 63
  • 9 x 8 is 72
  • 9 x 9 is 81
  • 9 x 10 is 90
  • 9 x 11 is 99
  • 9 x 12 is 108

Now, let’s try saying the answers together. Ready? Go!

  • 9 x 1 is 9
  • 9 x 2 is 18
  • 9 x 3 is 27
  • 9 x 4 is 36
  • 9 x 5 is 45
  • 9 x 6 is 54
  • 9 x 7 is 63
  • 9 x 8 is 72
  • 9 x 9 is 81
  • 9 x 10 is 90
  • 9 x 11 is 99
  • 9 x 12 is 108

Try It Yourself!

Now it’s your turn! Can you say the answers on your own?

  • 9 x 1 is ___
  • 9 x 2 is ___
  • 9 x 3 is ___
  • 9 x 4 is ___
  • 9 x 5 is ___
  • 9 x 6 is ___
  • 9 x 7 is ___
  • 9 x 8 is ___
  • 9 x 9 is ___
  • 9 x 10 is ___
  • 9 x 11 is ___
  • 9 x 12 is ___

A Cool Trick for Multiplying by 9

Here’s a neat trick to help you multiply by 9 easily. Take the number you want to multiply by 9, add a zero to it, and then subtract the original number.

Let’s try it with 9 x 4:

  • Take the number 4
  • Add a zero to get 40
  • Subtract 4 from 40
  • And you get 36!

So, 9 x 4 is 36. Isn’t that cool? Try it with other numbers and see how it works!

Keep Practicing!

Keep practicing these tricks, and soon you’ll be a multiplication master! Remember, learning can be fun and exciting. Say “Yes, I can!” and enjoy your math adventures!

  • Can you think of a time when you used the number 9 in your daily life? Maybe when counting something or playing a game?
  • What other tricks or patterns have you noticed with numbers that make math easier or more fun for you?
  • How do you feel when you learn a new trick in math, like the one for multiplying by 9? Does it make you want to learn more tricks?
  1. Finger Trick for Multiplying by 9: Use your fingers to help you multiply by 9. Hold out both hands in front of you. To find 9 times a number, like 9 x 3, fold down the third finger from the left. Count the fingers to the left of the folded finger (2) and the fingers to the right (7). Put them together, and you get 27! Try this trick with other numbers from 1 to 10 and see if you can find the pattern.

  2. Number Patterns with 9: Write down the multiplication table for 9 from 9 x 1 to 9 x 10. Look closely at the answers. Do you notice a pattern in the digits? Hint: The digits in each answer add up to 9! For example, in 9 x 3 = 27, 2 + 7 = 9. Try to find this pattern in all the answers and share your discovery with a friend or family member.

  3. Real-Life Multiplication Hunt: Go on a multiplication hunt around your house or neighborhood. Look for groups of items that you can multiply by 9. For example, if you see 9 apples in a basket, you can think about how many apples there would be in 2 baskets (9 x 2). Write down your findings and draw pictures to show your multiplication stories.

Here’s a sanitized version of the provided YouTube transcript:

Now it’s time for 9. Just do it! Memorize: One less than ten. Say “yes, I can.”

Multiply by 9:
– 9 x 1 is 9
– 9 x 2 is 18
– 9 x 3 is 27
– 9 x 4 is 36
– 9 x 5 is 45
– 9 x 6 is 54
– 9 x 7 is 63
– 9 x 8 is 72
– 9 x 9 is 81
– 9 x 10 is 90
– 9 x 11 is 99
– 9 x 12 is 108

Now say the answers before me:
– 9 x 1 is 9
– 9 x 2 is 18
– 9 x 3 is 27
– 9 x 4 is 36
– 9 x 5 is 45
– 9 x 6 is 54
– 9 x 7 is 63
– 9 x 8 is 72
– 9 x 9 is 81
– 9 x 10 is 90
– 9 x 11 is 99
– 9 x 12 is 108

Now it’s time for 9. Just do it! Memorize: One less than ten. Say “yes, I can.”

Multiply by 9. Now you give the answers on your own:
– 9 x 1 is
– 9 x 2 is
– 9 x 3 is
– 9 x 4 is
– 9 x 5 is
– 9 x 6 is
– 9 x 7 is
– 9 x 8 is
– 9 x 9 is
– 9 x 10 is
– 9 x 11 is
– 9 x 12 is

Here’s a cool tip to multiply by 9: Take the number you multiply by, add a zero, and subtract that same number.

For example, with 9 x 4: Take the number 4, add a zero to get 40, then subtract 4, and you’ve got the answer.

9 x 4 is 36. Try it; it’s cool!

This version maintains the educational content while ensuring clarity and readability.

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