81
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25, 36, 49, 64, 81, 100...
The next number will be 25 because 5 times 5 = 25
7^2 = 49 and 8^2 = 81
The next number is 0
The first thing to notice is that all the numbers in the sequence are square numbers. 25=5x5 36=6x6 49=7x7 64=8x8 81=9x9 So the next three numbers to be squared are 10, 11 and 12. 10x10=100 11x11=121 12x12=144 Thus, the next three numbers in the sequence are 100, 121, 144 The equation for the sequence is (n+4)2