Hello, Can you help me with my math homework?

7/16 - 5/12. Difference ??? Estimate???

5/6 + 9/10. Sum??? Estimate???

10 1/5 + 5 6/11. Sum??? Estimate???

6 2/9 - 2 5/6. Difference??? Estimate???

If you have Any advice on how to simplify these fractions, please tell me! Thanks!