Oh, what a delightful pattern you have there! It looks like each number is being divided by 3 to get the next number. So, starting with 243, if you divide by 3, you get 81. Then, if you continue dividing by 3, you get 27, and then 9. Keep exploring those numbers and see where they take you on your creative journey!
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Each number is 1/3 the value of the one to the left. The next number in the series is... 3.
you divide by three each time 729\3=243\3=81\3=27
1 x 243, 3 x 81, 9 x 27, 27 x 9, 81 x 3, 243 x 1.
9 243 - 81 = 162 81 - 27 = 54 162 = 54 * 3 54 = 18 * 3 27 - 18 = 9
If you mean: 1 3 9 27 81 then it is 3*81 = 243
243