Contributor: Meghan Vestal. Lesson ID: 11319
Do you understand times tables? Does multiplication by 11 seem tricky? We have a trick for you to help you learn the 11 times tables. Join the song, play an online game and make a Multiplication Wrap!
Tell a teacher or parent what you notice as soon as you look at these multiples of 11: 11, 22, 33, 44, … .
Throughout this series, Times Tables, you have learned how to multiply with two, five, and ten.
Let's try a few practice problems to make sure you are retaining what you have learned. Tell the product of each problem to a teacher or parent:
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 righthand sidebar, and go back to 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 actually very easy.
Did you notice any type of 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? Tell your teacher or parent.

1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
1 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
2 
2 
4 
6 
8 
10 
12 
14 
16 
18 
20 
22 
24 
3 
3 
6 
9 
12 
15 
18 
21 
24 
27 
30 
33 
36 
4 
4 
8 
12 
16 
20 
24 
28 
32 
36 
40 
44 
48 
5 
5 
10 
15 
20 
25 
30 
35 
40 
45 
50 
55 
60 
6 
6 
12 
18 
24 
30 
36 
42 
48 
54 
60 
66 
72 
7 
7 
14 
21 
28 
35 
42 
49 
56 
63 
70 
77 
89 
8 
8 
16 
24 
32 
40 
48 
56 
64 
72 
80 
88 
96 
9 
9 
18 
27 
36 
45 
54 
63 
72 
81 
90 
99 
108 
10 
10 
20 
30 
40 
50 
60 
70 
80 
90 
100 
110 
120 
11 
11 
22 
33 
44 
55 
66 
77 
88 
99 
110 
121 
132 
12 
12 
24 
36 
48 
60 
72 
84 
96 
108 
120 
132 
144 
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:
11 x 10 = 110 
1 (1+0) 0 = 110 
11 x 11 = 121 
1 (1+1) 1 = 121 
11 x 12 = 132 
1 (1+2) 2 = 132 
Add these tips to the foldable you have been creating throughout this series under the "11" flap. Then, review what you have learned about the 11 times tables by listening to the song 11 times trick (for numbers greater than 9) multiplication math song (Mr. R's Songs for Teaching):
What tricks for remembering the 11 times tables did you hear in the video? Tell your teacher or parent.
Listen to the song as many times as you need to, to get the hang of multiples of 11. Then, move onto the Got It? section to start solving problems.
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