Answer:
each time, you multiply the number by 9
Explanation:
1x9=9
9x9=81
81×9=729
If you wanted to know the next number in the sequence, just multiply 729 by 9 which equals 6561.
hope this helps.
multiply by 9
1 ×9 = 9
9×9 = 81
81 ×9 = 729
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