Expressed as a proper fraction in its simplest form, 13/20 - 7/30 = 5/12 or five twelfths.
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9/10 - 13/30 = 27/30 - 13/30 = 14/30 = 7/15
19/20 minus 11/12 = 1/30
21/30 - 8/30 = 13/30
13/30
7 and one third minus 3 and 9 tenths is six and 13 over 30 3 and 13/30