Q: How many 9s in 81?

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9 of them.

9*9=81 81-9=72 72/9=88

Oh, dude, you just take the repeating decimal 0.81 and turn it into a fraction. It's like a piece of cake! So, 0.81 repeating is 81/99, and when you simplify that fraction, you get 9/11. Easy peasy, lemon squeezy!

as in the multiples? 9 18 27 36 45 54 63 72 81 90 99 ...

9^2+9+9 +9/9 81+9+9+1=100

9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108

The pattern is: 9, 18, 27, 36, 45, 54, 63, 72, 81, and 108.

5

8

79

The GCF of 9s and 63s^3 is 9s.

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