Elizabethneedshelp Elizabethneedshelp 29-09-2017 Mathematics contestada Add or subtract.write each sum or difference in simplest form. 11. 3/8 + 5/24 12. 1/20 + 5/12 13. 9/20 - 1/4 14. 9/10 - 3/14 15. 3 3/8 + 5/12 16. 5 7/10 - 5/18