It is the squares in decreasing order from 102:
100 = 102
81 = 92
64 = 82
49 = 72
etc
So it will continue with 62, 52, 42, ...
The nth term is given by tn = (11 - n)2
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Reducing squares 100 = 10² 81 = 9² 64 = 8² 49 = 7² 36 = 6² so next is 25 = 5² ---------------------------------- For the given pattern the nth term (n = 1 to 5) is given by: t(n) = n² - 22n + 121
Reducing squares 9 x 9 = 81 8 x 8 = 64 7 x 7 = 49 6 x 6 = 36 so next would be 5 x 5 = 25
The next number will be 25 because 5 times 5 = 25
49
There are a few possibilities, but 100 is the most likely.