decrease £680 by 10% ?
10% of 680 is 68680-68=612
Taking off 10% of £680;10% of 680 =\(0.1 * 680 = 68\)Therefore;\(680 - 68 = \boxed{612}\)Also we could say that 10% off something is 90% of that number,90% of 680 = \(0.9 * 680 = \boxed{612}\)