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(1 31/20 - 1 12/20) + ( 4 21/20 - 1 7/20) =
19/20 + 3 14/20 = 3 33/20 = 4 13/20
d) (11 3/8 - 2 5/8) - (12 1/8 - 6 7/8) =
(10 11/8 - 2 5/8) - (11 9/8 - 6 7/8) =
8 6/8 - 5 2/8 = 3 4/8 = 3 1/2
(1 31/20 - 1 12/20) + ( 4 21/20 - 1 7/20) =
19/20 + 3 14/20 = 3 33/20 = 4 13/20
d) (11 3/8 - 2 5/8) - (12 1/8 - 6 7/8) =
(10 11/8 - 2 5/8) - (11 9/8 - 6 7/8) =
8 6/8 - 5 2/8 = 3 4/8 = 3 1/2