From School House Rock
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Number nine will put you on the spot
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Number nine will tie you up, oh, in a knot
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When you're trying
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Multiplying by nine
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You might give it everything you've got
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And still be stopped
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If you don't know some secret way you can check on
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You'll break your neck on Naughty number nine
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Now the first thing to keep in mind
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When you're multiplying by nine
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Is that it's one less than ten
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You see, nine is the same as ten minus one
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So you could multiply your number by ten
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And then subtract the number from the result
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And you'd get the same product
As if you'd multiplied by nine
And you knew it
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I mean, eight times nine is 80 minus eight
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And seven times nine is 70 minus seven
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And six times nine is 60 minus six
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You could use those tricks
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Because you must have some secret way you can beat it
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Or else you'll meet it
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With naughty number nine
G7 AbMaj7
Of course, it doesn't hurt
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To know the table of nines by memory
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It goes like this:
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One times nine is nine, and two times nine is 18
G7
(Mean ol' number nine)
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Three times nine is 27, and four times nine is 36
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Five times nine is 45, and six times nine is 54
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And seven times nine is 63
G7 Eb9 G7
Eight times nine is 72, and nine times nine is 81
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And ten times nine is 90
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Now the digit sum is always equal to nine
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I mean, if you add two and seven, the digits
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You get nine, the digit sum
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That's true of any product of nine
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If they don't add up, you've made a mistake
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Because you must have some secret way you can check it
F9 F#9
Or else you'll wreck it
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With naughty, nasty, mean old number nine