HARD SUBTRACTION. Be able to answer this in less than one minute.

1.75 53 =   26.77 59 =
2.54 14 =   27.94 48 =
3.91 36 =   28.20 13 =
4.61 33 =   29.61 32 =
5.99 26 =   30.24 15 =
6.94 80 =   31.29 18 =
7.30 13 =   32.88 57 =
8.17 16 =   33.66 44 =
9.58 32 =   34.77 44 =
10.21 18 =   35.72 64 =
11.54 37 =   36.15 15 =
12.91 86 =   37.98 10 =
13.57 30 =   38.30 13 =
14.27 25 =   39.33 28 =
15.95 73 =   40.17 10 =
16.62 51 =   41.56 26 =
17.80 79 =   42.40 37 =
18.49 34 =   43.46 44 =
19.29 29 =   44.32 11 =
20.94 86 =   45.97 29 =
21.77 31 =   46.56 31 =
22.75 64 =   47.56 34 =
23.92 86 =   48.45 24 =
24.44 10 =   49.53 21 =
25.50 34 =   50.67 51 =