Multiply 9
"Ninety-Nine Rhymes"
This hip-hop song gives students practice multiplying by 9. The song begins with mnemonics to help students remember their nine facts. The second half of the song contains practice problems which challenge students to sing out the answer before we do.
"Now 9 is a little bit magic,
You could take it from me or Trajik."
Yeah, when you multiply by 9,
The digits in the answer add up to 9.
"Hold up Trajik, I don’t get what you mean."
Ok take 9 x 2 which is 18,
1 + 8 equals 9,
And that’s true every time.
Check it out
9 times 10 is 90
9 + 0 equals 9
9 times 9 is 81
8 + 1 is 9
9 times 8 is 72
7 + 2 is 9
9 times 7 is 63
6 + 3 is 9
9 times 6 is 54
5 + 4 is 9
9 times 5 is 45
4 + 5 is 9
9 times 4 is 36
3 + 6 is 9
9 times 3 is 27
2 + 7 is 9
9 times 2 is 18
1 + 8 is 9
9 times 1 is 9
And 9 equals 9
Do you want know why I feel so fine?
I got ninety-nine kinds of rhymes,
I got ninety-nine kinds. (x2)
9 times 10 is …
9 times 3 is …
9 times 2 is …
9 times 7 is …
9 times 5 is …
9 times 4 is …
9 times 8 is …
9 times 9 is …
9 times 6 is …
9 times 1 is …
Do you want know why I feel so fine?
I got ninety-nine kinds of rhymes,
I got ninety-nine kinds. (x2)
9 x 10 = 90
9 x 3 = 27
9 x 2 = 18
9 x 7 = 63
9 x 5 = 45
9 x 4 = 36
9 x 8 = 72
9 x 9 = 81
9 x 6 =54
9 x 1 = 9
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