1) Her old house is bigger than her new one

=> Her new house is smaller than her old one

2) No one in my class is taller Peter

=> Peter is the tallest in my class.

3) The black dress is more expensive than the white one

=> The white dress is cheaper than the black one.

4) According to me, English is easier than Math

=> According to me , Math is more difficult than English

5) No one in my group is longer than Mary

=> Mary is the longest in my group