Bài 21: the adding by 3

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         https://www.youtube.com/watch?v=DXa7OD_xbPw

Alright kids, are you ready to learn how to add by 3?

 "Yeah!"

Well, let's go ahead and do it!

Here we go!

 3 + 0 = 3

3 + 1 = 4

3 + 2 = 5

3 + 3 = 6

3 + 4 = 7

 3 + 5 = 8

3 + 6 = 9

3 + 7 = 10

 3 + 8 = 11

 3 + 9 = 12

3 + 10 = 13

It's pretty simple...you know what I mean?

Excellent job!

Alright, it's time for us to turn the numbers around,

Start with 0 + 3 and go up.

Ready? Here we go!

0 + 3 = 3

1 + 3 = 4

2 + 3 = 5

 3 + 3 = 6

4 + 3 = 7

5 + 3 = 8

6 + 3 = 9

7 + 3 = 10

8 + 3 = 11

9 + 3 = 12

 10 + 3 = 13

 Well, that was simple, right?

 Now we're going to go all the way up, and then all the way back down.

Ready? Here we go!

3 + 0 = 3

3 + 1 = 4

 3 + 2 = 5

3 + 3 = 6

3 + 4 = 7

3 + 5 = 8

3 + 6 = 9

3 + 7 = 10

3 + 8 = 11

3 + 9 = 12

3 + 10 = 13

Now it's time to go back down

10 + 3 = 13

9 + 3 = 12

8 + 3 = 11

 7 + 3 = 10

6 + 3 = 9

5 + 3 = 8

 4 + 3 = 7

 3 + 3 = 6

 2 + 3 = 5

 1 + 3 = 4

 0 + 3 = 3

That's it! 

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