Tables of Doom: x9 Rule

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In this lesson, students learn how to multiply by nine using their fingers and by recognizing patterns in the nine times table. The finger trick involves bending down a specific finger to visually represent the product, while the pattern method shows that the digits of the answers add up to nine. With practice, students can become proficient in the nine times table through these engaging techniques.
  1. What is the trick you can use with your fingers to find the answer for four times nine?
  2. Can you explain the special pattern you see in the answers of the nine times table?
  3. How can you find the answer for six times nine using the tricks mentioned in the article?

Tables of Doom: x9 Rule

Using Your Fingers to Multiply by Nine

Do you want to know a cool trick to help you with the nine times table? You can use your fingers! Let’s find out what four times nine is. First, hold up all ten fingers. Now, bend down your fourth finger. Count the fingers before the bent one: one, two, three. Then count the fingers after it: one, two, three, four, five, six. So, four times nine is thirty-six!

Finding Patterns in the Nine Times Table

There’s another fun way to learn the nine times table by looking for patterns. Check this out: the numbers in the answers have a special pattern. The first number goes up, and the second number goes down. Plus, the two numbers always add up to nine! For example: one and eight, two and seven, three and six, four and five, and so on. Isn’t that neat?

Another Trick for Multiplying by Nine

Let’s try another example: what is six times nine? Here’s a trick: the first number of the answer is always one less than the number you’re multiplying. So, the number before six is five, which means the answer is fifty-something. To find the second number, think about what adds to nine. Five plus four equals nine. So, six times nine is fifty-four!

Practice Makes Perfect

Now that you know these tricks, try practicing them with different numbers. Use your fingers or look for patterns, and soon you’ll be a pro at the nine times table. Have fun learning and exploring the magic of numbers!

  • Can you think of other ways you use your fingers to help you with math or counting? Share your ideas with the group!
  • Have you ever noticed patterns in numbers or other things around you? What patterns can you find in your daily life?
  • Why do you think learning tricks like these can make math more fun? Can you come up with your own trick for a different math problem?
  1. Finger Magic Practice: Use your fingers to practice the nine times table with a friend or family member. Take turns choosing a number from 1 to 10, and use the finger trick to find the answer. For example, if you choose 7, bend your seventh finger and count the fingers before and after to find the answer. Can you do it without looking at the numbers?

  2. Pattern Hunt: Create a chart with two columns. In the first column, write the numbers 1 to 9. In the second column, write the answers to the nine times table using the pattern trick. Notice how the first digit goes up and the second digit goes down. Can you find any other patterns in the nine times table?

  3. Number Detective: Go on a number hunt around your home or classroom. Look for numbers that add up to nine. For example, find a clock that shows 3:6 or a book with page numbers 2 and 7. Write down all the pairs you find. How many different pairs can you discover?

Here’s a sanitized version of the transcript:

What is four times nine? You can use your fingers to help you work out the nine times table because you need to know four times nine. Bend down the fourth finger, count the fingers before the bent one: one, two, three. Then count the fingers after it: one, two, three, four, five, six. And that’s the answer to four times nine: thirty-six.

Another way to work out the nine times table is to look for the pattern. Look at these answers: the first number goes up and the second number goes down. The two numbers of the answer always add up to nine: one and eight, two and seven, three and six, four and five, five and four, six and three, seven and two, eight and one, nine and zero.

What is six times nine? The first number of the answer is always one less than the one you are trying to find. The number before six is five, so the answer is fifty something. To get the second number, just count on to nine: five add four makes nine. So the answer is fifty-four. Six times nine is fifty-four.

This version maintains the educational content while removing any informal or unclear phrasing.

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