Use fraction strips to help.
2. 3/4 - 1/4 =
3. 5/6 - 1/6=
4. 7/8 - 1/8 =
5. 1 - 2/3=
6. 8/10 - 2/10=
7. 3/4 - 1/4 =
8. 7/6 - 5/6 =