Multiples of Eleven

Lesson Plan - Get It!

Audio:

Throughout this series of Related Lesson, you have learned how to multiply with two, five, and ten.

Try a few practice problems to ensure you retain what you have learned.

• How did you do?

If you found any of these problems to be difficult, select the times table you are struggling with from the list of Related Lessons in the right-hand sidebar, and review those multiples before moving forward.

In this lesson, you will learn multiples of 11. Multiplying with double digits may seem scary, but multiplying with 11 is easy.

• Did you notice any pattern or repetition when you saw the list of numbers at the very beginning of the lesson?

If not, look at the multiplication table below. The 11-times tables have been highlighted.

• What do you notice when you examine multiples of 11?

You should have noticed that the product of any number from one to nine times eleven is just the number doubled.

For example, 9 x 11 = 99. The answer is just nine doubled.

There is also a simple trick for determining the product of any number from ten to eighteen times eleven. To find the product for these problems, write the sum of the digits between the digits.

See the examples below for a visual.

Add these tips to the foldable you have created throughout this series under the 11 flap.

Then, review what you have learned about the 11-times tables as you listen to and watch the video below.

• What tricks for remembering the 11-times tables did you hear in the video?

Listen to the song as many times as needed to get the hang of multiples of 11. Then, move to the Got It? section to start solving problems.