What do you notice? What do you wonder? in these sequences? • 40, 120, 360, 1080, 32401
• 2, 8, 32, 128, 512
• 1000, 500, 250, 125, 62.5
• 256, 192, 144, 108, 81

Explanation:

1)40, 120, 360, 1080, 32400

(it goes like add 80 then add 80*3 then 80*3*3 and then 80*3*3*3)

2)2, 8, 32, 128, 512

(it goes like 2, 2^3, 2^5, 2^7 and then 2^9)

3)1000, 500, 250, 125, 62.5

(keep dividing the sequence by 2)

4)256, 192, 144, 108, 81

(it goes like subtract (16*4) then (16*3) then (16*2) and then (16*1))

7.03-1.70=5.33 and 6.80+5.09=11.89 and 5.5-3.01=2.49