The Good Eleven: School House Rock video about multiplying by Eleven.

Lyrics

Good, good, good, good, the good eleven, yeah
It's almost as easy as multiplyin' by one.
Good, good, good, good eleven. (Mmmm)
Yes, eleven almost makes multiplication fun.

Some people get up at a quarter till seven,
Other people lie abed till 8:45 or nine.
But I'm happy just to hang in there till eleven,
'Cause eleven has always been a friend of mine.

Good, good, good, good eleven,
Never gave me any trouble till after nine.
Good, good, good, good eleven. (Mmmm)
Eleven will always be a friend of mine.

Now when you get a chance to multiply by eleven (eleven, Yeah!),
It's almost as easy as multiplying by one.
You don't even have to use a pencil when you use eleven,
And eleven almost makes multiplication fun.

You know why? (Yeah!)
Because you get those funny-looking double-digit doojies as an answer.
Like 22, 33, 44 and 55.
66, 77, 88, and 99 is your answer
When you multiply 11 by 2, 3, 4, 5, 6, 7, 8 and 9.

Good, good, good, good eleven,
Never gave me any trouble till after nine.
Good, good, good, good eleven. (Mmmm)
I can always get that answer easy every time.

Now eleven times ten is the same is ten times eleven (ten times eleven),
It's 110 no matter what you do.
And 121 is the answer to eleven times eleven,
And eleven times twelve is 132.

Eleven thirteens are 143, now. (That's 1-4-3)
Eleven fourteens are 154. (Dig it, it's 1-5-4)
1-6-5 and 1-7-6 are fifteen and sixteen.
You'd better pick up on the pattern,
'Cause I ain't got time to tell you any more.

I've got a date with the good eleven.
She never gave me any trouble till after nine.
(Good, good, good, good)
Good, g-g-g-good, eleven. (Mmmm)
Yes, eleven will always be a friend of mine.