For 25600.0, shift 4 decimal places to the left. Then, 2.56 x 104 has 3 sig figs, which are rounded up "already".
25600, 51200, 76800, 102400 . . .
25600/60 = 426.6666 minutes
25600
320 of 80 = 25600
25,600,000,000
22n-25622 = -25600
256 hundreds
huge
25600
256
Approximately 13.
% rate:= 256 x 100%= 25600%