Order six and three tenths repeating, negative six and four ninths, 630%, and −6.1 from least to greatest.

six and three tenths repeating, 630%, negative six and four ninths, −6.1
six and three tenths repeating, 630%, −6.1, negative six and four ninths
−6.1, negative six and four ninths, six and three tenths repeating, 630%
negative six and four ninths, −6.1, 630%, six and three tenths repeating